its a 94 GT i have run test on this it pops that the MAF sensor is running max voltage and then it says that the voltage is to low ihave change my IAC and it does change a thing. what it does is when i start it the rpm jumps to about 1800 then as i drive it the rpm increases to 2500. Ihave trouble shooted and when disconnect the air intake pipe off the throttle body the idle jumps down. I also plug the hole on the throttle body where its sux air in to the IAC and it also jump down it seems that to much is flowing threw that hole or something. it is also running lean because when idles at that speed for like 10 mins the headers turn glowing red from the heat out put and the test also said that it was running lean