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Q: MY CAR IS IDLING UP AND DOWN on 1990 Acura Legend

MY CAR WILL RUN, BUT IT'S KEEPS ON IDLE UP AND DOWN I DON'T KNOW WHAT CAN CAUSE THE PROBLEM CAN YOU HELP ME WITH IT.
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As Zee said vacuum leaks are most likely the cause but low coolant level or bad coolant temperature switch also causes this surging idle.
Sounds like there is a vacuum leak somewhere at the intake manifold.
Check all the vacuum hoses, make sure they are not disconnected or broken.

Zee
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