Rough idle like misfiring

Tiny
ADAM MOSER
  • MEMBER
  • 2003 FORD TAURUS
  • 3.0L
  • 6 CYL
  • FWD
  • AUTOMATIC
  • 161,138 MILES
It has been idling funny like it is misfiring. I replaced the Idle air control valve. Runs a lot better when driving. But in park it runs choppy as if it has a lope to the exhaust like if it has aftermarket cams in it. So I cleaned the TPS, MAF, and checked for vacuum leaks with throttle body cleaner. Nothing.

The only thing I can think of would be a cam shaft position sensor, crank shaft position sensor, a bad injector, or plugs. But no check engine light has came on or anything.

So no lights, no codes, what else could it be?
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Monday, November 28th, 2016 AT 12:42 PM

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Tiny
WRENCHTECH
  • EXPERT
First eliminate all vacuum or air leaks in the system (very important)

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 carburetor cleaner. Be sure to spray some into the small holes next to the throttle plate.
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Monday, November 28th, 2016 AT 3:16 PM

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