Engine revs going up and down at idle then shutting off

2003 FORD EXPEDITION
126 MILES • V8 • 2WD • AUTOMATIC
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GCOFF5
  • MEMBER
  • 1 POST
2003 ford expedetion eddie baur the service engine light came on and when you come to a stop the idle goes up and down shaking the car and then shuts off
Dec 28, 2010 at 4:16 PM
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DISCOSTU24000
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  • 37 POSTS
have you checked what codes are causing the light to come on? If you have codes P0171 and P0174( system lean banks 1 & 2) then check for a vacuum leak at the back of the motor, there is a 90 degree elbow connected to the PCV hose that leaks, a very common problem on this car
Jan 1, 2011 at 3:43 PM
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JACOBANDNICKOLAS
  • ✓Experienced Mechanic
  • 110,246 POSTS
Have the computer scanned to identify where the problem is coming from. IT could be a vacuum leak as well as an Idle Air Control valve (IAC).
Mar 22, 2011 at 11:31 AM
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