Originally Posted by Chilly-*****
I drive a '97 F-150 with a 4.6 liter, auto 4X4.
The engine runs rough when in drive at stop lights. Usually tends to act like it wants to stall, but after 30-40 seconds, it clears up and begins to run rough again after 15-20 seconds. It acts like the idle air control valve needs some help? Any thoughts?
Run a couple cans of Isopropyl alcohol / the red gas line antifreeze thru the tank to remove ice moisture. See if it helps it a lot. Ice starts this way, killing the motor and cutting off the power.