Question about 2000 Chevrolet Impala

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The engine is sometimes loping when idling but other times it is fine when i hit the brakes to stop some times the engine will idle down like its going to stall then way up and actually lurch the car forward and it has stalled a few times while driving mostly while turning it had a code that says MAF a low circuit input but i replaced the MAF and it is still the same i replaced the fuel filter and added dry gas and injection cleaner i have tried the throttle position indicator and the idle control valve from my dads car which is the same make model and year 2000 chevy impala base 3.4 and it did not change any thing i have checked for vacuum leaks and found a couple but after i fixed them still no change in the problem i am really confused and frustrated as oi can not figure out what is wrong with my car pleaze help

Posted by Anonymous on

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Hi, you may have a torn brake booster diaphram. Try disconnecting the brake booster and plugging the hose with a rag. Don't drive it without the booster, but set the parking brake and see how it runs in the driveway. If this clears up the problem, replace the booster.

Posted on Jan 03, 2011

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Here are a few things to check out. The intake ducting between the MAF and the throttle body must be air tight. Any air getting in that doesn't go thru the throttle body will cause idling problems and surging. Make sure the air filter is fresh. Replace the PCV valve, and finally, check the egr valve for leakage. Good luck. Hope this helps.

Posted on Jan 03, 2011

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Posted on Jan 02, 2017

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