BCNR 33 bogging / stalling

[MrRoboto]

Hi, new here, like the site, very informative.

I know many here are RB25 owners, but wouldn't mind giving it a shot. Any ideas are welcome.

I bought my GT-R two years ago, in almost stock condition (bar the exhaust). Beautiful car inside and out, everything was pristine, except for this bogging that existed.

The car would start, then all of a sudden stall. Give it gas, and it will not rev, even on the move. I can be driving along, and all of a sudden, it will hit a wall. Keep adding gas, it will struggle, burbling along, and when I pull it to a stop, it will stall.

The mechanics found a pool of engine oil in the stock airbox, which was cleaned. I changed the AFM's, and the problem still persists. Then did two things: a) cleaned out the fuel filter, and B) added an ARC oil catch. A few days later, the problems were gone, and the car's been running excellent since then, with zero problems.

So okay, fast forward till today. The car's been through some minor changes to the engine, including the addition of a oil cooler, HKS DD intakes, Koyo radiator, replaced the rocker panel seal, Denso 0.4 mm iridium plugs, and EVC V boost control. It's been running in this config for a while now, no problems whatsoever.

Decided to change the oil today. Been using 15w60 FK Massimo oil for the last change. Gave it a try, and decided that the oil pressure was too high. So went instead for Redline 10w40. Before the FK, I've been using Redline 15w50 exclusively. So 10w40 really shouldn't be a problem.

To get rid of the excess oil in the cooler, we used high pressure air into the oil cooler assembly (where the oil filter is) and pumped out the residual oil in the cooler.

Okay, so started the car, and it stalls. Thought it wasn't a big problem. Then kept driving, and the car keeps bogging down and stalling. First it was for a few minutes at a time, then it's narrowed down to a few seconds. Press the gas, car does not go, revs erratically, and when I let the gas go, it stalls.

So that's the story. Any ideas?