91 Tercel - erratic surging idle

[Trimagna]

The car starts and runs well.

There is a short period after it idles for about a minute and before it completely warms up that the engine surges. It can't decide between the fast idle (during warmup) and the slower idle (after warmup).

If I had specific examples of similar problems and solutions, I could buy the sensor and replace it.

I appreciate any help.

Thanks, - CarlD [email protected]

[my91tercelisapos]

Is the temperature gauge going up really fast when it does this? Check your coolant level. My 91 has a small leak in the water pump and whenever the coolant level gets too low it likes to rev back and forth on its own. I put more coolant in and it settles down (and the water pump will be replaced later this summer