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Idle fluctuates up and down when in gear and stopped

Tiny
RONALD TROXELL
  • MEMBER
  • 1979 LINCOLN MARK V
  • 6.6L
  • V8
  • AUTOMATIC
  • 80,000 MILES
My Lincoln drives like new until I stop for red light or stop sign. Then the idle starts up and down up and down when in gear. Much worse when in neutral.
Monday, October 24th, 2016 AT 6:08 PM

3 Replies

Tiny
HMAC300
  • MECHANIC
  • 48,601 POSTS
Try cleaning throttle plate on both sides and IAC hole with choke cleaner. Also, check for vacuum leaks like a cracked hose or one off etc.
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Tuesday, October 25th, 2016 AT 6:25 AM
Tiny
RONALD TROXELL
  • MEMBER
  • 5 POSTS
Thanks. I do not know what the IAC hole is or where it is located?
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Tuesday, October 25th, 2016 AT 1:44 PM
Tiny
HMAC300
  • MECHANIC
  • 48,601 POSTS
It's the idle air control motor but it's a n oblong hole in throttle body you'll see it
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Tuesday, October 25th, 2016 AT 4:29 PM

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