Questions at the bottom...

Here's my story. 100% stock 2007 Z51 convertible/ 6 speed. Aftermarket Radio (need my bluetooth!) - installed with soldered and heat shrunk connections - no taps to the battery.
On Friday, first time, during hard acceleration engine lost power and immediately regained it. Like a stumble.
On Monday, driving from Maryland into Virginia, same thing. Moderate acceleration, fully warmed up car, a stumble around 2500rpm. Instantly power came back.
Later, on the Washington DC beltway, I got my first ever "Reduced Engine Power" and by reduced, the engine had stalled. I was cruising at 65-70mph. I had enough speed to get to the side.

Car would not start.
Battery died pretty quickly (my opinion - a few restart attempts then click click etc. Message on dash about FOB. Power windows stopped working had to use the emergency release to open the doors)
All other gauges showed OK. No overheat, good voltage, Oil pressure fine (before the engine cut off).
While waiting for a tow truck, guy came by and offered to jump the car. I agreed. It started!!!! Everything was fine.

Went to autoparts store and scanned the car. MAF performance error P0101. Since I was there, with minimal tools, I replaced the MAF and had the battery checked out.
They claimed the batter was at 15+ volts and CCA was above the 600CCAs listed on the battery.

I drove about 75 miles - almost back home (about 1/4 mile) hit a bump (keep in mind its a Z51 car, so a pebble feels like a mountain) and same thing.
I tried disconnecting the MAF (trying to force it into speed density mode - worked on my old Z28....) Still no start
Again, the battery wore down very quickly (didn't recognize FOB, didn't crank, windows stopped working).

Towed it home on a tow strap. Immediately scanned the computer and the P0101 stood out. No history on the P0101 - so I'm not sure what triggered it.
Recharged the battery and tested it with an older OTC Battery tester. 600CCA advertised 660CCA measured. Voltage 13.6 but I noticed that while charging, the charging voltage peaked over 15V.
Alternator diodes tested OK. Charging system voltage OK (The OTC does it as part of its charging system check)
I do not know the history of the battery. It's an AC Delco.

This car has lots of electrical gremlins. Last year I went through and cleaned all the grounds and that cured about 90% of the issues.
I have a seat sensor issue on the passenger side that is bad.
I have a check engine light - O2 down stream sensor heater and one catalyst look bad.

Questions:
Should/Could a P0101 cause "Reduced Engine Power"?
Should an REP cause engine to completely stall and not be able to restart?
Could I have cleared the codes and gotten the car to run again? It seemed that once the battery lost enough power, a recharg/jump and everything was fine again. I plan on putting enough tools to disconnect the battery should it happen again.
My concern is that MAF is a side problem. Because the issue came as part of me hitting a bump, my concern is its a loose wire.... somewhere. I suspect the engine stalling itself could throw a MAF code.

I'm convinced the battery and charging system is OK. I will go back through the grounds.
I will install headers and a CAI and fixed the O2 sensor issues at that time.
I'm getting an EFI Live license for my diesel truck and intend for the 2nd license to be for vette. The vette doesn't need much - but I could tune out the MAF.

Any other suggestions?

 

Well first off you NEVER replace a part based on a DTC !!... was the MAF sensor wiring tested before you changed it ???...let us know if you need guidance on how to check it...based on the fact you hit a bump sounds like a bad connection...you may have to do a “wiggle” test of the wiring...this issue may also be a communication issue based on the fact that it would not start and the power windows not working...this is a common issue on C5’s...I’d see if you have any “U” codes (communication) DTC’s stored. A P0101 may cause a REP. Also did this all start after installing the aftermarket radio...these aftermarket radios can cause communication issues !!..just yesterday we had a C5 member who had issues similar to you...had the seat out and the seat control module wasn’t connected properly...he reseated the connector and all was well !!

 

So I had multiple DTCs. Only the MAF stoud out as a potential issue. So I took a chance. $120 with tax.
Now that I look back at it, I seem to recall an error code about a ECU power relay low voltage. Maybe the bump was enough? I need to go through the grounds again.
I'm gonna go through the DTCs again and see what I missed.
I saw someone mention acid from battery getting on wiring - will pull the battery and properly clean it and the connectors.

Funny you should mention the seat. I definitely have an issue with passenger seat. Corrosion on the connector... Will pull the seat and finally take care of that.

Then come the grounds....

The radio was installed almost 2 years ago. It wasn't fun leaving work, driving 6 speed and trying to talk on phone.

Anyway to reset this? I'm going to carry tools to disconnect/reconnect the battery from now on.

 

Reset what ??...see what DTC’s you may have had...if it’s a low voltage one I’d worry about power and not grounds right now...like I said you have to check that MAF wiring.

 

Just a dumb idea, but are you sure the battery cables are well tightened on the battery. I had an ACDelco on my car and the post/terminal connections would always work loose and cause problems. Later I got an Everstart battery and now the same battery terminal clamps grip very tight. The battery posts seem to be ever so slightly larger.

 

sometimes terminal on batteriers are a bit coney... happened to me... hard acceleration, engine stalled, christmas tree on dash....
it was positive clamp that came lose under acceleration