Q: I just replaced my maf sensor now my idle is up to 2000 rpms and bouncing up and down

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I was told my car needed a new maf sensor. We just replaced that and now my rpms are high and bouncing up and down on its own. Between 1000 and 2000. I put the old one back in to see if it would change the idle and no difference. I can't seem to figure out how to get my idle to go back to normal. Please help

My car has 200000 miles.
My car has an automatic transmission.

Hi there. Typically when this situation occurs, it’s caused by a vacuum leak. It is very common to either intentionally or accidentally remove a vacuum line while replacing a mass air flow sensor. What I would recommend is to retrace all hoses or connections, including the air intake connection as this can also cause a high idle problem. If you don’t find any lines not connected correctly and still have the problem, it might be an ECU computer glitch that should be resolved by having a professional mobile mechanic complete a engine idle is high inspection.

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