Well as im driving my car and sometimes while im idling, my engine does something strange. It makes sort of a little "bump" with a small subtle temporary increase in RPMs. Also my when im around 2-3 k RPMs my check engine light will come on and then a few seconds later it will go off then on again then later on it will come back on and do the same thing. It is definitely decreasing my performance. Also i have replaced spark plugs, spark plug wires, and distributor cap a few months ago. Does anyone know what this is?
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