LT1 starts stumbling around 2000rpms, it does not do this while it's cold. It starts just after the car is at operating temp and stumbles and has no pick up, and is running rich around 2000 rpms, but after that when you hit it picks up and gets down the road no problem.

We have replaced: Spark plug wires, spark plugs look good, replaced the coil(was bad), ignition control module(was bad), seems to have a slight exhaust leak, the pig tail to the coil has been sautered b/c the plug in broke, but it makes good connection but we are thinking that is part of the issue, we are ordering a new pig tail Monday, new belt.

Opti has about 90,000 miles on it, but if it was the opti wouldn't it do it all the time?

Any ideas? Thanks!

 

check the fuse for engine sensors first just to make sure it is not blown. Sounds like O2's

 

Does it stall?

 

No it doesn't stall.