1991 Toyota Corolla Q&A

1991 Toyota Corolla Question: Why my revs may be going up and down even when in drive.

i have been told maybe something to do with the auto choke any ideas, had a split raidioator hose -
Answer 1
Fill cooling system completely! Low coolant will cause that. -
Answer 2
OR WATER THE CAME OUT OF BLOWN COOLING MAY BE IN SENSORS -