My 89 5.0 doesnt fast idle when cold. What should I look for? I bought the car from a guy who was not sure what cam was put in to it. It has a bit of an inconsistant idle, not due to the cam, but wont fast idle.

I did a search but did not find this specifically in a topic.

 

If its just on a cold start up thats perfectly normal for a car not to idle perfect. Does it clear up after a mintue or two?

 

Fair, my main concern is the lack of a fast idle when cold. How do I get that back?

 

What controls the fast idle?