Why does my 2009 grand marquis idle rough?

Asked by Sheila Oct 28, 2022 at 09:45 PM about the 2009 Mercury Grand Marquis LS

Question type: Maintenance & Repair

Replaced my intake manifold and now my car
idles rough

4 Answers
202,505

Ed92626 answered about a year ago

Don't you just love pseudo-mechanics? Is the manifold right for the engine? Is something loose, like injectors or vacuum lines? Did you break something in the process? Enquiring minds wanna to know!

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5,315

Trippmeister answered about a year ago

Did you scrape down the surfaces for the new gasket? Bet there's a leak. Re-do the job, squirt gas around the intake joints, and see what happens. (just a little)

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