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Ford Mustang

Tiny
CHERYLA1099
  • MEMBER
  • 2003 FORD MUSTANG
  • V8
  • 2WD
  • AUTOMATIC
  • 80,000 MILES
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.
Monday, November 29th, 2010 AT 8:11 PM

2 Replies

Tiny
WRENCHTECH
  • MECHANIC
  • 20,758 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.
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Monday, November 29th, 2010 AT 8:12 PM
Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
Check the fuel pressure, and test the throttle position and mass airflow sensors also check for an exhaust restriction.
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Monday, November 29th, 2010 AT 8:13 PM

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