22RE engin idles uneven question

Joined
Jun 19, 2005
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42
Hello,

My 89 4 Runner has the 22 RE engine with auto gear box. As the weather has gotten colder now, the engine has started to act funny sometimes. When idling in neutral it sometimes runs uneven meaning reving up and reving down. Sometimes it is fine. It doesn't depend on the engine temperature since it appears whenever whereever. What could that be? Is the air mass flow sensor going? Or some coolant temp senor starting to go, causing the EFI to act funny?

Any ideas?

Thanks

Matthias
 

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