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1999 Ford Mustang

Tiny
CARELP
  • MEMBER
  • 1999 FORD MUSTANG
Engine Performance problem
1999 Ford Mustang 6 cyl Two Wheel Drive Manual

It appears I might need a tune-up:(ex.). Engine runs rough;levels at speed over 50. Help please.
Saturday, September 25th, 2010 AT 2:03 PM

1 Reply

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

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. Idle air control valve.
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Saturday, September 25th, 2010 AT 6:45 PM

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