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2003 Buick LeSabre with 3800 engine. Engine throttles by itself with no help from driver. 1500 rpm in gear or up to 3000 rpm in neutral. This is an intermittent problem.

Replaced TPS and throttle air controller. Cleaned throttle body.

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6ya6ya
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Posted on Jan 02, 2017

gant1611
  • 52 Answers

SOURCE: having idling problem on 1990 buick lesabre limited

Check for a vacuum leak. You may need to adjust the IAC(idle air control). If the power brakes are also very hard then its a vacuum leak.

Posted on Jan 01, 2014

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