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Re: 2003 Sunfire Rough Idle
It could be a a fuel issue, possibly the fuel pump or the filter. It could also be an ignition issue. Spark plugs, wires, coils, etc.
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"Ok, systems check; the battery is discharging, the oil temperature is very high, the oil pressure is very low, the engine temperature is off the end of the scale, I'm running out of petrol... but the clock is correct!"
-James May, in an old, worn out Lamborghini purchased for less than £10,000. 
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