600 to 1000 revolutions per minute (RPMs) is the typical average for idle.
If the idle is erratic on a 1993 Honda Civic the IACV will need to be clean or replaced. The IACV controls the idle on the car and when it fails the car will not be able to maintain an idle.
My 1990 idles at about 850 and with the ac on 1100
it should after it's started
vacuum leak.
Broken/disconnected throttle cable
It would depend on the car, but most are between 500-1000
1994 Chevy suburban....no coolant leaks...but looses coolant is this an older car? does the car loose engine coolant?
you might have pulled a vacuum hose off
the 1916 ford model T
Need to know year and type of car including what motor please.
Between 500-100,000,
Defective alternator.