I know you guys get tired of this question by I have tried every idea that I could find in the previous posts. I have and 89 LX but the motor and computer is out of a 91 GT (this car was factory a 4 cylinder car). The previous owner put the middle (I found that they had 3 cams on the web site and the model # was the middle one) trick flow cam and a GT-40 upper and lower intake on the car it is running the factory MAF and TB. The things that I have tried were flipping the IAC up side down, this made it idle way high so I tried to adjust the TPS to .98 volts once I did this it did not surge any more but the idle would stay at 1200 when it warmed up and would not fall (also would come down really slow between shifts)
So I went through the Surging Idle Check list and tried everything I could. The last thing I did was to flip the IAC back over and adjust the TPS to .90 now it will die when it is cold (in the morning if you don’t rev it till it has some temp it will die you cant just start it and let it warm up) and idle at 1000 when it is warm It also will die when you come to a stop sometimes not always it is almost like it can't catch its self. I would like to get it to idle below 900 rpms as to hear the cam and conserve some gas in traffic.
So I went through the Surging Idle Check list and tried everything I could. The last thing I did was to flip the IAC back over and adjust the TPS to .90 now it will die when it is cold (in the morning if you don’t rev it till it has some temp it will die you cant just start it and let it warm up) and idle at 1000 when it is warm It also will die when you come to a stop sometimes not always it is almost like it can't catch its self. I would like to get it to idle below 900 rpms as to hear the cam and conserve some gas in traffic.
