Hello, I need some help! About five mouths ago I swapped my stock 22r with a 20/22r hybrid. It ran okay, I always had a little problem with it idling right, but other than that I was a great success. A few week ago it started staling out and refuses to idle above 500rpm. I went to clean the crab and i found my air cleaner was covered in oil. My best guess is blow by gases are blowing oil in the air cleaner from the valve cover. But why? This was a rebuilt short block, new rings, bearings, seals, crank, and honed cylinders. With a 20r hilux head with what I believe to have 22r valves in it, but I don't know for sure , I got it off of Ebay. Can any help?