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I have a 2001 chevy impala it was driving fine and then it started getting a really high idle and is gaining speed on its own, do you have any idea what this could be I'm not overheating and I'm not stalling the car is just idoling really high and driving and gaining speed on on its own
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from what you are saying with out me checking it, the mass air flow meter is bad it is located in the air induct hose{the ********* hose going to the air filter} has a plug on it and attached to the flex air intake hose with clamps now a trick I learded first is crank car let idle take a wrench and tap the air flow meter and see if it dies or runs rough if so change the air flow sensor Good Luck MIke L.
With high idle in park, usually my first test is to block off mouth of throttle body. It should kill the engine, if no or very little effect on idle, You got false air getting in there from somewhere.
What about your cruise control? You can check and clean idle air system, where applicable? Any applicable trouble codes?
I don't know year--make--model?
A temp sensor out of range giving a false cold reading can cause high idle . A MAP sensor can also cause high idle by advancing the timing resulting in higher idle .
your check engine light will give you information that will help solve the problem-get the computer scanned, go to a retail auto parts store, they all do it for nothing. Write down the actual codes, and come back here with the codes, you will get the help you need.
I don't think the idle control valve would affect the car at off idle speeds. Sounds like a bad throttle position sensor. Can be found on or around the shaft of the throttle body. Get it tested first before replacing it.
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