2001 Mercury Marquis Car Park Idle Run S Fine Give Gas Rough Bit More Smooth S

2001 MERCURY MARQUIS
99,000 MILES
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JOLIFAEM
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  • 1 POST
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
Dec 8, 2012 at 1:01 AM
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JACOBANDNICKOLAS
  • ✓ASE Certified Mechanic
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  • ASE Certified Mechanic
Check for vacuum leaks and check for tune up
Dec 8, 2012 at 1:50 AM
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KANDRZIN
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  • 4 POSTS
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?
Dec 31, 2012 at 5:34 PM
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KANDRZIN
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Actually, the roughness happens at idle and smooths out with higher revs, which is a little different from JoLiFaEm's problem.
Dec 31, 2012 at 5:35 PM
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