Ford Mustang

2003 FORD MUSTANG
80,000 MILES • V8 • 2WD • AUTOMATIC
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CHERYLA1099
  • MEMBER
  • 1 POST
2003 4.6 liter and it just started running rough when accelerating, and the idle is poor. It has not stalled out and once I get the speed up it runs fine.
Nov 29, 2010 at 8:11 PM
Repair Safety Notice: This information is for general instructional purposes only. Vehicle repair can be dangerous. Verify all information, follow manufacturer service procedures, use proper tools and safety equipment, and consult a qualified repair shop when needed.
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WRENCHTECH
  • AUTOMOTIVE REPAIR CONTRIBUTOR
  • 20,761 POSTS
You may have a bad IAC ( idle air control) but try cleaning the throttle body first. Remove the intake snorkel, have someone hold the throttle wide open for you and scrub the back side of the throttle plate and surrounding bore with an old tooth brush and some carb cleaner. Be sure to spray some into the small holes next to the throttle plate. That should help stabilize the idle. If it still has a problem, replace the IAC.

Nov 29, 2010 at 8:12 PM
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RASMATAZ
  • AUTOMOTIVE REPAIR CONTRIBUTOR
  • 75,992 POSTS
Check the fuel pressure, and test the throttle position and mass airflow sensors also check for an exhaust restriction.
Nov 29, 2010 at 8:13 PM