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Misfire in #6 Cylinder Code PO 306

(1999 Ford F-150)
in Cumberland, MD on August 28, 2015
full of fluid in cylinder when went to change plug cleaned it up new plug worked for awhile now missing real bad again and same code. Any ideas what all I need to do to fix this problem.
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Popular Answer
on August 28, 2015
What engine.. 6 or 8 cyl ?.. Smoke//steam from tail pipe??
what is the level, and condition of the coolant? might be a head gasket issue
what kind of fluid was found? coolant, or oil? was the fluid found on top of lug before removal, or was the cylinder full of fluid
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