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

18,510

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

Your Answer

Add photo

Related Questions

  • coil and spaek plug replacement 12 answers

    check engine light on, and car runs rough

    2004 Mercury Grand Marquis

    -

    Maintenance & Repair

  • 2006 Grand Marquis, Intermittent Rough Idle followed by Overheat 18 answers

    I have a 2006 Grand Marquis, Normal 4.6L V8. Every couple days, my car will randomly begin idling seriously rough, with the rpms dropping to 300-500, then jumping back to normal every few seconds....

    2006 Mercury Grand Marquis LS Premium

    -

    Maintenance & Repair

  • MY CAR IS RUNNING ROUGH FROM TIME TO TIME. 20 answers

    About a month ago my 1998 Mercury Grand Marquis started running rough after I pumped regular gas at a Chevron Station. As the car has 67,000 miles I took it to Sears Auto Center to have the spark plug...

    1998 Mercury Grand Marquis 4 Dr GS Sedan

    -

    Maintenance & Repair

  • What can be the cause for engine coolant leakage on my 1987 Mercury Grand Marquis ? 4 answers

    My '87 Mercury Grand Marquis is loosing some engine coolant. There are 2 water spots on the floor - one in the front located near the water pump, the other behnd the engine. Can' t locate where the co...

    1987 Mercury Grand Marquis

    -

    Maintenance & Repair

Search Mercury Grand Marquis Questions

Mercury Grand Marquis Experts

#1 Tracy Hooks
Tracy Hooks
Reputation 5,450
#2 kbro
kbro
Reputation 2,060
#3 Js08016
Js08016
Reputation 1,740
View All

Related Models For Sale

Used Ford Crown Victoria
11 Great Deals out of 1,068 listings starting at $2,995
Used Lincoln Town Car
31 Great Deals out of 1,829 listings starting at $1,750
Used Chevrolet Impala
585 Great Deals out of 31,590 listings starting at $799
Used Mercury Marauder
26 listings starting at $9,795
Used Ford Mustang
460 Great Deals out of 45,656 listings starting at $1,999
Used Ford Taurus
233 Great Deals out of 20,420 listings starting at $2,258
Used Ford F-150
2,181 Great Deals out of 206,248 listings starting at $1,499
Used Chrysler 300
404 Great Deals out of 19,887 listings starting at $1,000
Used Cadillac DeVille
6 Great Deals out of 1,633 listings starting at $1,999
Used Chevrolet Tahoe
557 Great Deals out of 28,837 listings starting at $1,699
Used Buick LeSabre
14 Great Deals out of 1,931 listings starting at $995

Used Cars For Sale

2007 Mercury Grand Marquis LS Premium For Sale
4 Great Deals out of 102 listings starting at $2,495

Content submitted by Users is not endorsed by CarGurus, does not express the opinions of CarGurus, and should not be considered reviewed, screened, or approved by CarGurus. Please refer to CarGurus Terms of Use.