Happy 4th.
So I just got my c5z on Friday. The engine has a few mods. Nothing out of the ordinary. Cam, headers, cold air intake, fast 102, Borla exhaust. I bought it this way from N. Carolina. I live in Florida and ac is a must, at least for me. So for the past few days after I start it up and let it warm up for a couple minutes I turn on the ac and it begins to shake. No ac, just a little shake. When cruising down the road and I come upto a stop and push the clutch in, it drops down in rpm and just stalls. If I leave the ac off it won't stall at all.
Just changed plugs and wires, cleaned air filter and MAF. Still does the same thing. Any ideas would be greatly appreciated.

 

If this thing is tuned you may need to check “idle air” settings for the AC on and off…if you live in Southwest Florida I can take a look at it to see if it may be something else.

 

More information, the car is really stinking, the exhaust fumes are making my eyes water. Could it be a bad o2 sensor? When the air is off it idles around 1200 rpm. I also see high flow cats.

 

I live in the Jacksonville, Florida area.

 

Yes, an O2 sensor “stuck” low (well below 450mv’s) will cause the PCM to increase injector pulse width since it is seeing a false lean condition when there is none..I’ve experienced this myself with a bad upstream Bank 1 O2 sensor…mine was stuck at 100mv’s…you will need a scan tool to see this…this may be due to your high flow cats.