Need some help????

[Bryce'sStang]

I can't seem to find any decent help anywhere on the internet except here. So my question has to deal with my 95 F150 with a 351w. I have a high idle sometimes and it stays there. I pull the plug from the IAC and it idles good. Is this the problem. By the way it is speed density!!!
Thanks

 

[cjones]

run the KOEO(Key on engine off) and KOER(key on engine running) tests and reply back with the codes (if any) and when KOEO or KOER they came up.

i ask you to do this because the tests check the IAC operation.

 

[Quick5pnt0]

Try cleaning the throttle body plate and the inside of the IAC motor with carb cleaner if you haven't already done so.
Mike

 

[RacinChris]

I can't seem to find any decent help anywhere on the internet except here. So my question has to deal with my 95 F150 with a 351w. I have a high idle sometimes and it stays there. I pull the plug from the IAC and it idles good. Is this the problem. By the way it is speed density!!!
Thanks

Bryce, I know it's been a while... but, any updates? Did you get it fixed? I ask this because I'm having very similar problems with my speed density 5.0 in my Mustang . Borrowed an IAC from a '91 Grand Marquis 5.0, same results. Maybe a vacuum leak?