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Hi Im David, the most probable cause for this is a bad catalytic converter
DTC P1300Catalyst damaging misfire multiple cylinders Drive cycle C:Signal out of range - above maximum.Possible causes by suggested order of priority:^ Fuel pressure too low. ^ Crank synchronization problem ^ Ignition coil fault ^ Fuel contamination. ^ Engine mechanical fault.Fuel Pressure Too Low.CHECK THE FOLLOWING:^ Fuelling adaptions show enrichment.^ Check fuel pressure with fuel pressure gauge.POSSIBLE FAULTS^ Fuel filter blocked.^ Fuel pressure regulator fault.^ Fuel pump fault.Crank Synchronization ProblemCHECK THE FOLLOWING:^ Sporadic reference mark error count raised.^ Reset count possibly also raised.^ Crank sensor fault is set.POSSIBLE FAULTS^ Crank sensor wheel physically damaged.^ Crank sensor out of position.^ Crank sensor faulty.DIAGNOSTIC HINTS^ Raised reset count with a zero reference error count may indicate a 12v supply problem.^ Diagnose fault with raised ref error count as a crank sensor fault.Ignition Coil FaultCHECK THE FOLLOWING:^ Misfire counts high for all cylinders using coil 2 (1,4,6,7).^ Misfire counts high for all cylinders using coil 1 (2,3,5,8).^ Misfire counts high for all cylinders.POSSIBLE FAULTS^ Problem with 12v supply to coil pack 2 (cylinders 1,4,7,6).^ Problem with 12v supply to coil pack 1 (cylinders 2,3,5,8).^ Problem with 12v supply to both coil packs.^ Coil pack 2 faulty.DIAGNOSTIC HINTS^ Raised misfire counts on paired cylinders 4+7, 2+3, 1+6, 5+8 indicate a problem with one coil drive or secondary circuit.^ Raised misfire counts on groups of four cylinders 1+4+6+7 or 2+3+5+8 indicate coil pack problems.^ Raised counts on groups of four cylinders 1+3+5+7 or 2+4+6+8 indicate a bank fuelling problem.Fuel Contamination.CHECK THE FOLLOWING:^ Misfire counts equally high for all cylinders.^ Fuel pressure measured with fuel pressure gauge reads normal.^ Abnormal fuelling adaptions.^ Engine running very rough.^ Visual check of fuel in fuel line (take sample).POSSIBLE FAULTS^ Fuel contaminated.Engine Mechanical Fault.CHECK THE FOLLOWING:^ Raised air flow at idle.Cylinder compressions.^ Cylinder leakages.^ Valve timing (Faulty or worn CAM).^ Spark plug condition - check for oil or carbon fouling.POSSIBLE FAULTS^ Valve, Piston or CAM problems causing low engine efficiency.^ Engine running rich causing carbon deposits on spark plugs.
just checking in to see how its going