2004 mercury grand marqee, the engine is running extremely rough. I have checked the coils and they seem fine. what else could cause this problem??

Asked by Oct 08, 2016 at 10:30 AM about the 2004 Mercury Grand Marquis LS Premium

Question type: Maintenance & Repair

Even at low speeds 30 35 it skips really bad. The plugs seem ok. When I hit the
gas hard it seems to respond well but at 55 mph it skips quits badly.

2 Answers

20,320

Would change out spark plugs if have not done so in awhile because it is very hard to determine whether or not just be looking at them to tell if plugs fouling out at low speeds.

He's right your car could shut off on you while driving if not done

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