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Issue with stalling on low speed.

Tiny
STEVE L
  • MEMBER
  • 1999 PONTIAC BONNEVILLE
  • 6 CYL
  • FWD
  • AUTOMATIC
  • 107,000 MILES
I have a 1999 Bonneville that stalls at low speeds, around 35mph or less, always with my foot off the gas.I have replaced the throttle position sensor and the idle air control valve, and it still stalls. It will usually start again right away after stalling. Any help with this problem will be greatly appreciated.
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Saturday, June 14th, 2008 AT 4:46 PM

1 Reply

Tiny
MERLIN2021
  • MECHANIC
  • 17,250 POSTS
If the SES light is not on, You may have a vacuum leak, get a can of spray gumout, spray the vac lines and maniflod area, when the idle changes, youve found the leak! You want the engine running and spray on the outside but do direct the stream onto the hoses, if it is a vacuum leak, the engine idle will change speed, then you have detected a leak, repair the vacuum leak and see how it runs! If SES is on, read the codes! Autozone does it free.
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Monday, November 5th, 2018 AT 7:07 PM

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