Everyone's favorite p0300

[lorderos23]

I'll give you the history first. About 2 months ago I pulled the engine out to put JUN cams, wiseco 10.5:1 pistons, and maramello rods in it. I did the work myself since I'm a technician. I have full Megan exhaust except the stillen headers, no cats or pre cats just open tubes. The intake's are Injen's, I have been tuned but since this problem was found out on the dyno, who knows how accurate it is....(It's uprev)

For the first 500 break in miles everything was ok. Then once I started getting on it more and more I noticed fuel in my oil, only slightly at first(the CEL light had been on because of the O2 sensors, so I thought anyways,) Then I noticed it was losing some power. So I checked all the plugs and only #6 was fouling, except that it was caked in oil and fuel, So I thought "****, one of the rings not be right". So I preformed a compression and leak down test, after I cleaned the cylinder, 220 psi for 20 minutes. Not the rings. The rings just are not sealing when the walls are coated in fuel. Now I checked the injector pulse with a noid light, it was no different then the rest. Changed back to my stock injectors and problem still there. Moved the coil and plug, problem still there. Since I don't have access to consult III(I work for Honda), I can't check some of the live data since Uprev has the worst data feed I've ever seen, thanks for giving me bank1 and 2 not the whole ******* engine.

I ordered a coil since one of them was weak anyways, and will replace that today. I'm also going to replace the 02 sensor that was throwing the performance code from a while ago, but it said bank 1, #6 is on bank 2(I think unless Nissan just decided to do things differently). I'm also going to try a different plug (e3's, cause they work wonder's in my 77 280 with a turbo on it.) Also the coil(no matter which one, makes good spark on #6, same with the plugs.)

So any idea's out there on the problem, I'll update you guys tomorrow on everything to see if the 02 magically fixes this. But with out some data or Nissan's theory of operation, I'm kinda pissing in the wind right now.