2000 Ford Explorer Interemittent misfires?

Tiny
EITRI
  • MEMBER
  • 2000 FORD EXPLORER
  • 6 CYL
  • 4WD
  • AUTOMATIC
  • 81,500 MILES
After sitting all night, the engine will run rough for a minute or so, but it clears up after 30 or so seconds of driving.

Also having random misfires that may or may not be related. Check engine light was on, code indicated Cylinder 3. Pulled the plug and checked, looked OK so I replaced it. Cleared the code, a week later it was Cylinder 4.

Misfires happen very infrequently at any speed, but are definitely more consistent in the first 30 seconds after starting the engine cold.

Perhaps completely unrelated, my idle speed in park and neutral is 1000-1500RPM, but drops to ~900 when put into gear. That seems abnormal to me.

Any ideas?
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Friday, August 8th, 2008 AT 4:26 PM

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Tiny
MERLIN2021
  • MECHANIC
  • 17,250 POSTS
Did you actually replace just one plug? Did you check the gap on it? If it's wider than the recommended setting, at least pull all out and regap. During cold start the system runs rich in open loop, and an improperly gapped plug may not burn the rich mixture as well as it should.
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Monday, December 21st, 2020 AT 11:23 AM

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