2001 Pontiac Bonneville engine idles up & down

2001 PONTIAC BONNEVILLE
170,000 MILES • 6 CYL • FWD • AUTOMATIC
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CHARLIEMARTIN1971
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My engine idles up and back down at a stop. I have changed my O2 sensors(2 of them) and it still does it. Any more help
Nov 23, 2008 at 1:58 PM
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LEGITIMATE007
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you can give your engine a good top engine cleaning , like cleaning the throttle body /plate, etc. also you may want to check your idle air control vave too
Nov 23, 2008 at 2:24 PM