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I also found that if the water level in the radiator is to low, the motor will idle up and down. When I topped up the water level, the idling returned to normal. That was after it started idling...

I had the same behaviour on my 1989 Honda Accord LXi - rev up and down when warm. Very annoying. But the fix was easy:

What you most likely have is a dirty IACV a.k.a. Idle Air Control
Valve that...

I had the same behaviour on my 1989 Honda Accord LXi - rev up and down when warm. Very annoying. But the fix was easy:

What you most likely have is a dirty IACV a.k.a. Idle Air Control
Valve that...

I had the same behaviour on my 1989 Honda Accord LXi - rev up and down when warm. Very annoying. But the fix was easy:

What you most likely have is a dirty IACV a.k.a. Idle Air Control
Valve that...