2009 Malibu 2.4 ecotec. It has intermittent rough idle, missing at highway speed. So far have replaced plugs,Fuel rail flush, MAF sensor. Replaced cam shaft position sensors and actuators (was getting MIL CODE for the cam shaft) Light went out after changing cam sensors. After all this the car still runs like shit. Any ideas?
ignition module and sparkplug wires would be the next items.
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Have you verified the fuel system is up to par? Pressure and volume?
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