I took advice from the guy at pepboys and bought a decoder and a haynes service manual for a 95 f150 4x4 5.0. The great thing is that the decoder actually tells you codes of whats wrong. Unfortunately i had to settle for the base model (the one with the flashing red light) instead of a digital screen. I tried getting a digital one but my truck just misses it by 1 year . It does up to 96 well i have a 95 so either spend 300 bux on a digital one or spend thirty and count beeps. So i counted the beeps and it looks like i have a code #12 . when i look up 12 in my code book, it says "system cannot raise engine speed above normal idle". What the heck does that mean? I spent a few hours lookin thru my hayes manual but that thing is almost as good as a childrens book, hardly has anything i could use in it the index is terriable. Will someone please help me get the answers to my problem, your knowledge will be greatly appreciated.

 

Try cleaning the iac. The computer uses this to raise engine idle speed. It may be stuck, or malfunctioning. The computer only sends a signal out, but doesn't know if it is working or not unless the rpms raise.

 

How should i check it? Do you think you could give me an idea where i can find info on how to. My manual isnt specific enough. I really appreciate your help