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Throwing code p0306?
new wires plugs rotor cap o2sensors and mass airflow sensor

(1997 GMC Yukon)
in Placerville, CA on December 08, 2012
this model has throttle body
and distributor

high missfire when accelerating
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Popular Answer
on December 08, 2012
What did the plug cyl. #6 look like when you took it out ? was it oil fouled? was it indicating a 'lean' misfire? Compression & valves/rockers good? Vacuum leak from intake?
on December 08, 2012
possible coil
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