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Possible Causes

Possible Causes 
CURRENT PCM DTCS
CURRENT SKIM DTCS
RESTRICTED EXHAUST
ENGINE MECHANICAL
VACUUM LEAKS
CRACKED SPARK PLUG(S), CARBON TRACKING SPARK PLUG AND COIL
CARBON BUILDUP ON THROTTLE BODY
FUEL CONTAMINATION
FUEL DELIVERY
VALVE TIME OUT OF SPECIFICATION
5 VOLT SUPPLY CIRCUIT
SENSOR GROUND CIRCUIT
CMP SIGNAL CIRCUIT
CAMSHAFT POSITION SENSOR
CKP SIGNAL CIRCUIT
CRANKSHAFT POSITION SENSOR
FLEX PLATE (TARGET WHEEL)
CMP AIRGAP
CKP AIRGAP
POWERTRAIN CONTROL MODULE