It depends on the size of the engine and the number of cylinders it has. An eight cylinder could idle between 550 and 850 rpms while a four could be between 700 and 1000. It is possible that the rpms could even be higher, but that again depends on size, cyl, and year it was made. The best way for you to answer this question is to look in the owners manual if you have one. If you are lacking the manual, ask at a local parts store. The people at the auto parts store are always happy to help because if the car is broken, it could mean a sale for them. Just remember to bring the following information for them. Make of car (Ford, Chevy, etc.), model of the car (Mustang, Impala, etc.), year it was made, the size of the engine (289 cubic inches, 2.2 liter, etc.), and the number of cylinders. Good luck!
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