1989 iroc z 350 tpi. i just got this car, my first TPI. first off it ran like crap when i got it, fixed some vacuum lines and such and now when it is cold it runs pretty good no stumbling or stalling revs ok. when it gets warm it idles like it has a huge cam and idle speed goes down. when warm if i attempt to hit gas it usually stalls. when i restart i usually have to hold the pedal to the floor. and it seems to run really rich. Now this is my opinion of whats wrong and why. I can unplug #6 and #8 injector when running and no change of anything. if i unplug others idle changes. So im thinking bad injectors? it seems like everything on these cars screws them up the same. ive heard bad tps, iac, egr, injectors, ect ect. any opinions

 

pulled codes and i get a code 15 coolant temp sensor. and code 42 which i think is because i pulled brown wire to check timing. will reset and check later. cant i unplug coolant temp sensor to tell me if that is the problem?

 

More than likely unplugging it won't change anything. You need to replace the sensor right under the Throttle body. The one in the head is for the gauge. It should fix it.