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Whats causing the p0306 code

(1997 GMC Yukon)
in Placerville, CA on December 08, 2012
replaced rotor cap plugs wires o2sensors mass airflow sensor and still getting code p0306 and it has a distributor and a throttle body, so what now
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Popular Answer
on December 09, 2012
Did you clear the code after repair? If so check compression and for a vacuum leak on or near # 6 cyl. Third cyl on pass. side.
on December 09, 2012
check the coil
on December 09, 2012
Only one coil for all cylinders. Should not set po306.
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