code P0302 would indicate a misfire in cylinder #2 .Most common thing is a plug or wire , But this could be a number of other things causing cly. #2 to misfire.
Chances are that you have a bad plug wire
Chances are that you have a bad plug wire
P304 means misfire on number four cylinder. Can be bad spark plug ,bad plug wire,or bad fuel injector. could also be loose plug wire or injector wire. How many miles since tune-up ?
Could be a bad ignition coil (if coil on plug equipped). Could be a bad spark plug or wire
Could be a bad plug wire,spark plug,coil. Really need to know what your working on and the engine size.
PO303 indicates a misfire on cylinder #3. Normally caused by bad spark plug or plug wire.
2008 malibu 3.6 L code says PO302 misfiring Misfiring in number 2 cylinder. Could be an ignition problem with a bad spark plug or spark plug wire. Could also be a bad fuel injector. Could also be a mechanical problem such as a bad valve. Start with new plugs and wires.
bad spark plug wire.
cylinder 5 missfire detected. could be plug, wire, or bad coil...
Because you have a misfire on cylinder #2. Can be defective spark plug, bad plug wire, or bad coil if equipped with coil on plug. Can also be a burnt valve, blown head gasket or bad fuel injector if applicable.
Bad plug, bad wire, bad distributor cap or bad valve.
Bad spark plug, plug wire. I hade that problem it was a cracked head "Expensive"