New answers tagged rough-idle
This sounds like a problem with the Idle Air Control (IAC) valve. This valve is a small motorized gadget which helps maintain the idle in the engine. (NOTE: Not knowing what year your car is, I looked at the last year for the Protoge5, which was 2003, which does have an IAC.) You may be able to clean up the old one with some carb cleaner, which I would try ...
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