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?
December, 31, 2012 AT 5:35 PM
Actually, the roughness happens at idle and smooths out with higher revs, which is a little different from JoLiFaEm's problem.