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

16,810

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

  • 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

  • 2001 Mercury Marquis Engine Stalling for no Apparent Reason 8 answers

    I have a 2001 Merc Marquis w/ 300,000+ miles. Been great car, never a major repair. Started to stall intermittently. Requires turning key off to get it to restart. Service guy is telling me migh...

    2001 Mercury Grand Marquis LS

    -

    Maintenance & Repair

  • Does this seem like a warped intake manifold? 59 answers

    One day after getting on the highway, my car began repeatedly misfiring and slowly losing power. After about 10 miles, it was running like total shit. Ended up changing the coil pack. Noticed one o...

    2003 Mercury Sable LS

    -

    Maintenance & Repair

Search Mercury Grand Marquis Questions

Mercury Grand Marquis Experts

#1 Tracy Hooks
Tracy Hooks
Reputation 4,900
#2 kbro
kbro
Reputation 1,970
#3 Js08016
Js08016
Reputation 1,490
View All

Related Models For Sale

Used Ford Crown Victoria
7 Great Deals out of 1,487 listings starting at $2,900
Used Lincoln Town Car
44 Great Deals out of 2,131 listings starting at $1,999
Used Chevrolet Impala
964 Great Deals out of 36,457 listings starting at $1,800
Used Ford F-150
3,380 Great Deals out of 205,479 listings starting at $1,273
Used Cadillac DeVille
1,965 listings starting at $1,600
Used Ford Mustang
713 Great Deals out of 38,571 listings starting at $1,963
Used Chevrolet Tahoe
1,086 Great Deals out of 31,949 listings starting at $1,495
Used Ford Taurus
358 Great Deals out of 22,407 listings starting at $1,499
Used Buick LeSabre
11 Great Deals out of 2,352 listings starting at $1,768
Used Chrysler 300
497 Great Deals out of 21,026 listings starting at $1,500
Used Chevrolet Silverado 1500
2,667 Great Deals out of 149,055 listings starting at $1,800

Used Cars For Sale

2007 Mercury Grand Marquis LS Premium For Sale
8 Great Deals out of 114 listings starting at $2,495