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You might laugh at me, but when my IMRC box went, my car would jump down to 250rpms and give me the check engine light telling me the butterflys were stuck open. After I replaced the box my very low idle disapeered....just another thing to check out. Rev the engine and look by the side of the intake (driver side) You should see movement when the rev limiter kicks in and you let off the throttle....
 
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