[Gitsum3x]

Help!!!!!!! Idle problems. My 86 gt is having idleing problems. It runs great however, after a few minutes it will start to fluctuate up and down. And if I cut the air conditioner on, which puts an additional strain on the engine, it will idle down so much that it will cut off. Of course it has a 302 5 speed that is pretty much stock. Somebody before had mentioned the idle arm but I dont know. I've also heard that this model was notorious for having this issue. If anyone could help it would be greatly appreciated.

Thanks Mark..

[tripleblack]

Welcome Home to AFM! I'm bumping this to the 5.0 forums, where I think you can get lots of help...

[89blackstang304]

Clean yout idle air bypass valve and mass air meter if you have one.

[nadrepadre]

what he said plus make sure your are intake doesn't have any leaks in it. Mine was surging pretty bad too and I fix it today with pvc parts from home depot. Another thing you can do is pull your filter and everything off the throttle body and start it up cover the end of the throttle body and see if it shuts off. If not than you have a serious vacuum leak somewhere.

[Masshole]

dont forget to dielectric grease your sensors...especially IAC.

[Gitsum3x]

Originally Posted by 89blackstang304

Clean yout idle air bypass valve and mass air meter if you have one.

thanks for the info. Cleaned the idle air bypass valve with carb cleaner and it did the job. Thanks again!!!!!

[Gitsum3x]

Originally Posted by nadrepadre

what he said plus make sure your are intake doesn't have any leaks in it. Mine was surging pretty bad too and I fix it today with pvc parts from home depot. Another thing you can do is pull your filter and everything off the throttle body and start it up cover the end of the throttle body and see if it shuts off. If not than you have a serious vacuum leak somewhere.

thanks dude. It was the idle bypass valve.....