I have a 92 gta 5.7tpi the car runs great, but I have a problem. The problem is complicated, the car idles 1200 rpms in park when the temp is below 160. The car will continue to idle at 1200 park even when the car is at normal running temp unless I turn the car off and restart, if I do that the car will idle down to about 850 or(650) in gear. I have changed the fuel injectors to bosch(type 3) stock replacement. I already replaced the iac. valve and the tps sensor, I have also change the computer to a stock replacement, and the ecm water tem. sensor. I am stuck don't know what else that it could be any help would be greatly appreciated !!!!!

 

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The computer is a stock replacement