Rough idle

Tiny
DOUG BELL
  • MEMBER
  • 1994 FORD MUSTANG
  • 3.8L
  • V6
  • 2WD
  • MANUAL
  • 175,000 MILES
When warmed up idle jumps up and down until it shuts off. Bank 1 and 2 running rich. Changed IAC.
Monday, August 7th, 2017 AT 2:52 PM

1 Reply

Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 42,833 POSTS
Hello,

It sounds like you have a vacuum leak or an engine misfire. Here are a couple of guides so we can get started.

https://www.2carpros.com/articles/how-to-use-an-engine-vacuum-gauge

and

https://www.2carpros.com/articles/engine-vibration-at-idle

and

https://www.2carpros.com/articles/stall-at-idle

Please let us know what happens, we are interested to see what it is.

Cheers, Ken
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Thursday, August 10th, 2017 AT 9:47 AM

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