I have alot of questions so this is one of many I have a 1989 crx si with a b20z2 motor and a b16 tranny the motor while idling revs up and down it pulls it air in the intake while it does this any knowledge on why it does this?
Yes. Check ALL your smog devices. One of them is not behaving properly.
idle air control valve is dirty or the coolant lines in ur throttle body are clogged
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