2008 chevy impala Odd issues?

My 08 impala V6 3.5 is sputtering at low RPM (under 1000) and I was getting a cylinder misfire code but I replaced all the spark plugs and it was fine but then it started sputtering again about 2 weeks later although I have no check engine light and I've noticed it doesnt sputter when the AC is off. (Dont know... show more My 08 impala V6 3.5 is sputtering at low RPM (under 1000) and I was getting a cylinder misfire code but I replaced all the spark plugs and it was fine but then it started sputtering again about 2 weeks later although I have no check engine light and I've noticed it doesnt sputter when the AC is off. (Dont know if this is related but one of my blinkers will be on when I turn on the car)
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