Posted by 4play on October 09, 2017 at 21:18:54 from (70.215.212.115):
In Reply to: Question posted by Goose on October 09, 2017 at 19:00:07:
If you don't have a scanner to read data or even codes, I would start with a cheap/free guess by cleaning the throttle body and idle air control valve. The IAC is on the top LH side of the throttle body, its pointed toward the alternator, and mounted by two screws.
It could also be the intake/plenum gaskets. I've seen a lot of these leak vacuum on cold starts and then not leak once engine warms up slightly, it can happen fairly quick in a minute or less. The old gaskets shrink and become brittle, when cold they leak vacuum but then swell slightly as temps come up. These would progressively get worse, to the point it won't idle good at all and have a check engine light.
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