Mechanics

MERCURY MARQUIS GAS PROBLEM

2001 Mercury Marquis • 99,000 miles

The car is in park at idle run's fine give it some gas and it run's rough give it a bit more gas and it smooth's out like a dead spot in the throttle same when driving
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JoLiFaEm
December 8, 2012.




Check for vacuum leaks and check for tune up
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Same thing is happening to my 1995 Grand Marquis with 242.000 and I just had a tune-up. I will look for vacuum leaks and in fact considered this as a problem. Might it also be a problem with a blocked air intake or a blocked fuel injector?

Tiny
Kandrzin
Dec 31, 2012.
Actually, the roughness happens at idle and smooths out with higher revs, which is a little different from JoLiFaEm's problem.

Tiny
Kandrzin
Dec 31, 2012.

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