No go... I'm still checking a few other things out, but it looks like it's unrelated to the tank location. I've swapped tanks and no different... Then I took a brand new tank as well as the same old tank and strapped them to the side of the fuse right behing the engine... Ran short (maybe 3" each) lines to carb and muffler... Still does the exact same thing... The moment I pick the nose up she dies out on me... I also put a new pressure fitting on the muffler, this one with a much larger inner diameter. As well as making sure the muffler was sealed tight everywhere and no leaks. I'm now going to swap this engine for an OS in another plane... Then see if problem follows the engine... If it's still doing it then it's gotta be something with the engine... I dunno... Will keep everyone posted...