My buddy just bought a blaster cheap. The kid said he rebuilt the top end (which I believe because it's 126 psi). I know a little about the oil injection block off kit as you people taught me about it. It's missing the cap on the carb where the oil injection went so it idles ok for a few seconds then it gets loud and rough, could that air way be the problem? Sounds like an air leak but I'm not sure if that's the problem. And would a leak tester catch that on a leak test? My other buddy has one but is out of town so we couldn't test.