Code says #3 cylinder misfire, check the coil pack for this cylinder to see if its got spark, bad o2 sensor will spit another code, its most likely the coil
P303 is telling you that you have a misfire on cylinder number 3. This requires the replacement of the number 3 coil pack.
Doesn't sound like and o2 sensor, p0303 is a cylinder 3 mis-fire. could be a injector problem.
When standing in the front of the vehicle the cylinders are numbered 1-4 up the passenger's side and 5-8 up the driver's side.
Firing order for the 5.0 liter V8 is
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