Tariq Roland Petersson

I have checked over all the cables, modules and coils even changed out the ignition timer. I'm still finding that it says dtc code 00515 that there is a fail somewhere with the ignition of one of the cylinders, I have found it to be on the first cylinder checked all the electrics leading to it but it still runs poorly unless I gas it a little bit. What could I be missing??
I also find a bit of oil near the spark plugs when I have removed the ignition system, new oils seals. Any advice would be awesome.