2003 Ford Mustang Q&A

2003 FORD MUSTANG
102,000 MILES • V8 • 2WD • MANUAL
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BBAYNARD
  • MEMBER
  • 1 POST
My mustang won't keep a steady idle. It runs from 700 to 1500 at times. The cars been doing this for 4 plus months now, in summer and now winter. It changes on a whim. I asked Bobby kurgan a NMRA Champion that owns a shop and he said it could be a vacuum line but I can't find a bad one. The car has no codes could you help me?
Dec 22, 2008 at 7:37 AM
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BLACKOP555
  • ✓Experienced Mechanic
  • 10,386 POSTS
could be a vaccum leak somewhere, best way to test that is to use a smoke tester, carb cleaner works well too but isnt no where as easy and conclusive as a smoke test.

clean out your throttle body also, and your iac module, check the pintle should be moving freely.
Dec 27, 2008 at 1:09 AM
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