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84 Mercury Grand Marquis Missing

Tiny
JOHN SOARD
  • MEMBER
  • 1984 MERCURY MARQUIS
  • V8
  • 2WD
  • AUTOMATIC
  • 86,000 MILES
I have an 84 Grand Marquis that is missing when I give it gas after I first start the car. It completely goes away and runs smooth after I drive about 1 mile. I changed plugs and wires and fuel filter.
Wednesday, November 17th, 2010 AT 2:19 AM

1 Reply

Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
Engine running rough or misfiring can be cause by the following:

https://www.2carpros.com/articles/engine-misfires-or-runs-rough

1.Defective spark plug
2.Inadequate spark/coil,defective spark plug wire.
3.Lack of compression
4.False air leakage.
5.Faulty fuel injectors.
6.Insufficient fuel pressure.
7.Contaminated fuel.
8.EGR valve that is leaking.
9.Oxygen sensors.
10.Throttle position sensor.
11.Manifold absolute pressure sensor
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Wednesday, November 17th, 2010 AT 2:26 AM

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