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What's up skyliners

Would anyone know why my car is idling @ such a high RPM? (1500RPM)

It seems to be constant, and it's been like that for a while now. Sometimes the Revs will even bounce, usually when starting up the motor, or coming to a stand still from acceleration.

Besides that, the engine seems to be running smoothly. I can even let go of the clutch in gear 1 without having to step on the accelerator, and it won't even stall on me.

Was fine until i was thrashing it up and down the street one day. Left it there for half a day then it happened. Tried cleaning the AFM. Same same.

Could be a vacuum leak? i highly doubt it. Any suggestions?

Cheers.

Skyline R32 btw.

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