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Hi... I have an 07 - 300... I am throwing this code... changed the 02 sensor on the drivers (passenger ok)... changed the fuel injector and it’s still happening... running real rough and hesitant acceleration.. any suggestions???
 

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P0303 = A fault was detected on cylinder #3 . Causes could be a defective coil pack, a defective coil pack wire or a defective spark plug.
 

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From the service manual:

P0303-CYLINDER 3 MISFIRE

When Monitored:
Any time the engine is running, and the adaptive numerator has been successfully updated.

Set Condition:
When more than 1.0 % misfire rate is measured during two trips, or with 10% to 30% misfire rate during on
trip. Three good trips to clear the MIL.

Possible Causes:
ASD RELAY OUTPUT 2 CIRCUIT
INJECTOR CONTROL NO.3 CIRCUIT
COIL CONTROL NO.3 CIRCUIT
IGNITION WIRE
SPARK PLUG
IGNITION COIL
FUEL PUMP INLET STRAINER PLUGGED
RESTRICTED FUEL SUPPLY LINE
FUEL PUMP MODULE
FUEL PRESSURE LEAK DOWN
FUEL INJECTOR
ENGINE MECHANICAL PROBLEM
PCM
 
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