Well this isnt the greatest first post ever, but here goes. I got an 89 IROC with the L98. It started getting the (not wanting to run while hot) syndrome. I replaced the plugs, wires, coil, cap, rotor, ignition module, and injectors. The injectors were the last replacement. And I was sure that was going to fix the problem due to the fact that I had 3 that were reading only single digits in ohms. Well, the car no longer misses and dies when it gets hot, it just doesnt want to pick up from idle. If you slowly give it gas it will rev but anything slightly faster and it will tend to sputter and fall on its face before finally picking up. This is while the engine is operating temp. When its cold it doesnt want to run at all. When its semi warm it runs almost perfect for about 5 minutes, and then bam, back to the problem at hand. I have gone thru and checked the timing, its spot on 6 degrees. I have gone thru the procedure of adjusting my idle via setting TPS at .54volts and unpluggling the IAS, blah blah blah. The idle is fine when engine finally wants to run. This is the first TPI I have had any problems like this with. SO. Any Ideas. I could sure use em.

 

i'm going through sort of the same deal, mine drives fine until it warms up and then drives like its got 3 plug wires off. i replaced cap,rotor, ignition module,coil,plugs,wires, and lastly the cpu and its still the same. i have 5 injectors with single digit ohm readings (5 ohms) so i think im gonna try and put some lt1 injectors in that i got lying around. good luck to ya

 

after driving mine off and on for the last 2 days I have gotten a little more info on it. Now it just acts as if it is EXTREMELY cold natured. after its been running/driving for around 15ish minutes it drives almost normal aside from the stutter off idle. It will pick up rpm just has the stutter. If you let it sit over night and go to start it next morning then it will be just like before, wont hardly run and have to pump the gas like a carb car. I had the issue before all the parts where when it was cold it ran fine but when it got hot it would miss, stall and eventually die and you would have to wait an hour or so before it would start back up. The injectors fixed that, it just developed something else in the mean time.