Originally Posted by
teamshadyinc
The idle valve you speak of is that the idle air control valve?
Yes, IAC valve.
My carbed 1983 F250 also gives me 1mpg better mileage than the 1988 F150, despite being 1/2 ton heavier, but doesn't have the performance of the F150.
Both 351W, but the 88 does have a C6