Have code po306 cylinder 6 misfire detected. What should I look for bad plug on 1998 Mercury Villager

Seems to be running on 5 cylinder when under lug but runs fine some of the other times. Starts and idles fine.

by in Lenexa, KS on November 28, 2012
2 answers
ANSWER by on November 28, 2012
Have compression checked if ok a GOOD tune up may be in order.
ANSWER by on April 21, 2013
yes i changed knock sensor lower intake gasket upper intake gasket added antifreeze also changed injector rings still runs rough and doesn/t stay on steady shuts off

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