I had one of those too but oddly enough it came on with the code for fuel filter so I changed my maf and fuel filter but it still ran like crap... Then I put techron in and it was a dirty injector lol It would do kinda what yours does but I never increased pipe size so idk... It'd go to like 2 grand and be gone then have spurts where it went away then came back but it hasn't since the cleaner. I can't see why relocating the maf sensor would matter, its the same volume of air everywhere in the pipe.. Someone school me on that? If you want a tune I have a shop for you