[offthewall158]

I just got my 1990 gt running good now my only problem is that it idles high when the clutch pedal is released. (1500-2000rpms) when the clutch is engaged whether the trans is in gear or in neutral it idles perfect right around 800-1000 rpms with minimal surging. i rebuilt the motor last summer with a set of gt40 heads and intake, b303 cam and mac longtube headers. ive worked out all the bugs (i think) except for this one. and i have never heard of this problem before. any ideas?

[mattdel]

Hard to say. Good place to start would be vacuum leaks, but I'm thinking this might be related to the neutral switch, I just need to find out what year the ECM programming included an idle bump for shifts.

[offthewall158]

im 99% sure there arent any vacuum leaks. as for the neutral switch, is that located behind the clutch pedal?

[mattdel]

Nope, the clutch switch on the pedal is to prevent starting in gear. The neutral switch is on the trans, up near the shifter. Should be a 2 prong.

[Dj_Seph]

Had same problem when I did some mods. I had a clogged IAC and an exhaust leak. Not sure which exactly was the issue.

[offthewall158]

Originally Posted by Dj_Seph

Had same problem when I did some mods. I had a clogged IAC and an exhaust leak. Not sure which exactly was the issue.

i do have an exhaust leak that i just havent gotten around to fixing, but im pretty sure i cleaned my IAC motor before putting it on.

[offthewall158]

unplugged the neutral switch on top of the tans and fixed my problem. purrs like a kitten