Ok, heres the problem. When its first starting to warm up it runs just fine. THe problems begin when it gets to operating temp. It starts stumbling and it idles weird. Like it will jump from 900-1300rpm up and down. WHat do u think? I also ran some seafoam through it and it seems to run worse. I stumpted and broke so i dont have enough money to just throw out and get it takin into a shop. Anyone with this same problem PLEASE HELP.

 

Opti?? Fuel and Spark are the major causes of that sympton..start by eliminating which one it isnt..new opti..new pump..etc..

 

I had a similar problem with my car. The car would run great for about 20 minutes or so and then just turn to complete crap within the snap of a finger. It turned out to be my fuel pump, when they start going bad they can over-heat themselves. One other thing that comes to mind is the ignition control module. It is attached to your coil right in front of the driver side cylinder head. When they go bad the heat from the head will cause them to short out, hence making the car run like crap. I dont know for sure what your car is doing but this is just a couple of ideas. Good luck with getting it solved, peace, Dustin.

 

LT1s are kinda infamous for this, common culprits are: Plugs, wires, coil, and opti.

If you think its the fuel pump, check your fuel pressure. Not too fun to swap that thing out.