Daughters is coming over tomorrow with a problem, 93 small 6cyl, manual transmission. She spent the night on the 4th , next morning it starts but the rpm's drop almost to the stalling level, surges back up and repeats for about 2 minutes then it's fine, she told me it had been doing it for about a month ( she's away at school so I don't see the truck too often) Saw a previous post about a problem with the idle air control valve could it be the same thing or any other suggestions as what to look at . With it only lasting for a few minutes it looks like it will be hard to pinpoint.
Thanks for any input, Phil