Nickel and diming

Just today I rerouted the plug wires so they aren't crossing , they are Taylor 8.5 mm, not cheap. I also moved the coil wire around to. None of it made difference. There was a tad bit of oil down in the intake so there is some kind of leak . I just don't think that would cause this kind of misfire, it's like one cylinder completely stops firing for a few minutes and then back to normal. I'm thinking maybe an injector or crank sensor, but I really don't know. I may try a new coil just for *****. No check engine light what so ever. Thanks for all your replies