Why does my grand marquis idle rough in park?

Asked by Guru9ZH2N1 Dec 08, 2020 at 12:14 PM about the 1988 Mercury Grand Marquis

Question type: Maintenance & Repair

Why does my my 1988 grand marquis idle rough in  
park but acts fine when I press the gas

2 Answers
26,800

oilyspill answered 3 years ago

The basics for a rough idle, check for a leak of some kind, fuel--egr--vacuum. Check and clean anything that has to do with idle air system. Clean throttle bore and around throttle plate, see if it helps.

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Guru9ZH2N1 answered 3 years ago

There is a vacuum leak but I cant find it, when I put it in park you can hear it, then goes away when I press the gas

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