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

Average mileage: 138,000 (128,000–148,000)
Engines affected: 2.2L 4 Cylinder, 4.3L V6
1 model year affected: 2003
2 people reported this problem
2 people shared problem details
2003 Chevrolet S10- 2.2L 4 Cylinder148,000
Found code P0300. The solution was the coil for cylinder 2&3 bad. Replaced coil, engine running good.
2003 Chevrolet S10- 4.3L V6128,000
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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