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(EDIT NOTE: I made a bad assumption about the HEI distributor, so deleted all of that nonsense. Please do the following to see if it is an issue, though.) Please check the following: Take the distributor cap off so you can observe the rotor Put a socket on the crank shaft snout bolt (where the main crank pulley is at) Turn the crank clockwise until you ...


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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