91 GRAND 5.0 LITER

1991 Mercury Marquis

Tiny

nk972003

December, 10, 2006 AT 11:02 PM

I have a '91 Grand Marquis and when I turn on my car there are 1 or 2 surges in rpm and then it cuts out unless I hit the accelerator immediatly. After that it runs fine until I have to stop at a light or slow down and then it cuts out again. I had this problem before except it only happened when I ran the AC or heat but it would only surge and not cut out. ( By the way AC does not coo if that helps) I had a major tune up about a month ago and put in concentrated fuel treatment but it still happens.
Any help would be great.

Thanks,
Nikki

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Tiny

merlin2021

March, 5, 2007 AT 6:59 PM

Surges are caused by vacuum leaks. Get a can of spray gumout, start the car, or have someone else do it and spray around vac hosoes and the corners of the intake manidold, when a change in RPM occurs you are in the right place. 5.0 engines have a problem with the aluminum intakes disolving at the corners! Also were the PCV plugs in at the back, top middle of the intake, the rubber bushing becomes brittle. This cauases oil and air leaks!

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