Chevrolet S10 Problem Report

Chevrolet S10 Engine started running rough suddenly, Check engine light flashing.

(2 reports)
Found code P0300. The solution was the coil for cylinder 2&3 bad. Replaced coil, engine running good. -
engine started running rough.barely made it home. now what? engine oil dip stick said one quart low,so i added quart yesterday. maybe wasnt low. would over filling oil make it run like that? -
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