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Rough idling

Tiny
JAYARDITO
  • MEMBER
  • 1999 PONTIAC BONNEVILLE
My 1999 Bonneville idles rough It seems alright when I first start the car and it is cold, but as soon as it warms up it idles rough. When the car is running and in park and the A/C running, if I turn the A/C off I can see the tach needle start to bounce up and down and then the car shuts off. While driving, if I come to a stop and the car is in drive I can see the tach needle bouncing up and down
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Sunday, June 20th, 2010 AT 4:34 PM

1 Reply

Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
Hi JAYARDITO, Welcome to 2carpros and TY for the donation

Clean out the idle air control valve and the EGR and PCV valves and test the throttle position sensor and the manifold absolute pressure sensor.
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Monday, November 5th, 2018 AT 7:07 PM

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