2005 pt cruiser misfire low rpm

Google all the possibles

TYPE: OBD PO303

Chrysler OBD PO 300

hot or cold. or both
what is RPM at rough idle, too low,, below 800 rpm?
its misfire, do a tune up.

Trouble Code: P0301

Cylinder No. 1, 2, 3 or 4 Misfire Detected

Trouble Code Conditions: Engine is running; atmospheric pressure, fuel level, battery voltage, engine speed, engine load are above minimal predetermined specifications; the engine is not in fuel cutoff and intake air temperature and coolant temperature are within normal operating ranges; there are no DTCs relating to ECT, CMP, CKP, MAP or IAT Sensor, to Crank rationality, to Crank Sensor Learn invalid, or to System Voltage. If total misfires detected are greater than 7% during the first 1000 rpm, or are over 3% after the first 1000 rpm, or are 25% during any 200 rpm with suspect cylinder misfire counter more than 80% and no other cylinder misfire counters above 80%, this DTC will set. The MIL will flash after first trip occurrence and will be steady after second trip.

Possible Causes:


Fuel system problems existErratic CMP or CKP Sensor signalsIgnition system problems existEngine mechanical problems existPCM has failed

the light flashes when damage to the converter is happening,either by misfire or over rich condition . a misfire will cause the bucking and jumping. a bad injector will over rich the system also have checked with scanner a clogged converter will set the light on.

the coil pack

Emission devices in vehicles sold in the US are covered for 8 years. This is federal law. Talk to the service manager at your local dealer. A misfire will cause emissions to go up so it should be covered.

anything from bad wire .plug or fuel delivery problem to cylinder 1pull plug and c if fouled -also test wire for break

They are still looking for a cause because it isnt misfiring right now or because they cant find the cause of the stored misfire codes ?
If it is misfiring right now and they cant figure it out then perhaps you should find new mechanics !
I have seen a lot of bad coils on the PT.
Misfire is usually caused by spark plug wires first, spark plugs 2nd, and coil third.
If it isnt misfiring now, spray down the wires with water. If it misfires after that replace the spark plug wires and spark plugs and try again.
If it still misfires then the problem will likely be the coil.

That is the first thing i would suggest you do. Replace all the spark plugs and the plug wires. Those 2 things are the most commen thing that cause misfires.