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Changed the maf and truck is idling way too fast, cleaned old maf and put it back in and still idling way too fast
My car has 160000 miles.
My car has an automatic transmission.
This may be related to a dirty or faulty idle air control valve. As you may know, this works similarly to the mass air flow sensor in that it relays air information to the computer which then makes adjustments to fuel based upon this information. The idle air control valve, however only operates at low speeds and at idle. This allows the proper air/fuel mixture to happen at idle and also when the engine rpm's are decelerating from a higher rpm.
When this is not working properly, this may cause an erratic idle as you have described. This may also be caused potentially by an intake air leak or a vacuum leak as this will create a lean fuel condition also causing a higher idle speed.
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