cylinder misfire code on #4

[valrathe]

The plugs and wires are not more then 8 mths old, so when i checked them i found a small deposit of oil on the end on the plugs, I cleaned them and put them back ran good for a bit then code again shop said little to no reading on that cylinder. Was thinking that oil was leaking and fouling the plugs any idea what to change or fix i am not ase tech of any sort, but i like to learn. car is a 2000 GTP

[TheOtherNick]

Do a compression test on the cylinder. Might have a junk piston.