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What could cause a 1989 Mercury Grand Marquis difficulty to start idle and run in cold weather only?
Updated: 10/24/2022
you have to replace the idle air control.
Answermake sure there are no engine misses(badd plugs and/or wires) always monthly use stp fuel injector cleaner (black bottle only) and make sure the air cleaner isn't oiled or really dirty (replace if havent lately. sometimes they look clean but they are `NT
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