Hello everyone I have a 1991 mustang gt with idle problems. I had posted the things that was happening to my car .I checked the tps.good/I changed the idle control valve,I changed the temperature cooling sensor/air temperature sensor. Changed the distributor module/plug /plug wires .checked for air leaks found nothing. And still had problems. Timed it to 11 before top center. And still no good. Also when putting the car on reverse or drive it will turn off .so the last thing I did was to check the transmission fluid and it was low .so I added some fluid to the right amount and quest what now I put it on reverse or drive and it doesn't turn off so far I need to take it for a drive to see if it holds up.just want to share it.hope everyone has a great weekend.