Recently, I installed catless 1 3/4" LT headers, x pipe, and mufflerless Borla exhaust, and removed the AIR system on my 2002 Vette and have ran into some issues:

At idle, my rpms will surge from 550rpm to 400rpm or less, and if I do not give her throttle or shift to neutral, she will stall out.
While driving, the rpms will drop to sub 700rpm and less when I left off the throttle, and can cause her to stall out.

These issues just came up a few days ago, but she drove totally fine the first week after the install. Now, she will crank, but does not want to fire. I pulled the codes off my OBDII reader and here is what I gathered:
P0135 (upstream O2's)
P0140 (downstream O2 bank 1, sensor 1)
P0160 (downstream O2 bank 2, sensor 2)

Of course, I removed the downstream O2's as I have no cats, so I expected that code. I am going to check to make sure the upstream O2's have not been crossed and are in working condition today, but my my question is would bad/crossed O2's cause starting issues? The surging rpm and rough driving/idling, but would it cause these starting issues?

I will also be checking G105 and G106 to ensure they are connected well.

This is my first header install and I did a ton of research before starting on it, so its pissing me off that I managed to screw it up... any help would be much appreciated.

Thanks,

Austin

 

Sounds like you need a reprogram, eliminate the rear Oxy sensors, etc.. and a
power tune & remap..

Alex, did wonders for my '56 LS1 T-56 210 Coupe/ My C5 Vert is next...

good luck

http://www.pcmperformance.com/

 

For that p0135 code, sounds like you may have a short and/or blew the o2 heater fuse. Check fuse #15 under the hood

 

O2 wires melted on the headers possibly?