Q: Code p0303 pulled cylinder 3 misfire

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Rough idle and poor gas mileage and cuts out bad between 40 and 45 mph Changed all plugs, coils, throttle position sensor, throttle body, air filter, maf sensor, fuel filter, gas cap, and have tested each fuel injector. Any other suggestions?

My car has 169000 miles.
My car has an automatic transmission.

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