I have a 1999 V10 F350 and it has been sitting in the yard for about two weeks and has been only moved once. Today I got home from work and decided to drive it to KFC. It started up fine but then this rough idle kicked in. I started up the road and the the engine acted as if was fighting to get gas. It did not cut off or anything, just ran rough. It still has stupid power and will smoke the tires even when I'm not trying. When I hit the gas hard, it levels out and runs fine but then it starts back after a while. Could it be bad gas or something else. Any input on this guys?

 

might be the idle air control valve, its on the driver side of the throttle body.



heres something on it

http://www.fordf150.net/howto/throttlebodyclean.php