It probably only happens when the defroster (heater) is on. Never really paid attention to that, I just know it happens when it is cold outside and we probably do have the heater on when it happens.
When it does happen, it makes the RPMs go up and will try to make the truck roll faster at a stop. Then when the "roaring" stops, it will drop the RPMs low and then resume normal. I know its strange, I am no mechanic, but I usually can figure this kind of stuff out. I am stumped.
Saturday, January 10th, 2009 AT 11:01 AM