Guage Engine

1990 celica 1.6L coolant issue?

the temp guage doesn show overheating, but sometimes will flutter between the 1/4 and 1/2 on the guage. engine will also rev up to about 3k rpm and back down to 1.5k rpm and do this several times. not sure if they are linked. compression is fine in all cylinders. not losing coolant, radiator is full. anyone have any clues?? thanks

I'd look at the coolant sensor. The one wired into the computer system.Sounds like It may be fluctuating between normal running temp and cold temperature making the idle increase. Check It. That's what It sounds like to me.

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