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check for an intake leak. I'm not exactly sure, i havent played much with these lately, been working on some turbo 4 cyl, and pro tractor and truck pulling motors, but if the mass air is before the leak the car will be thinking its getting more air than it is and dumping fuel because. it will run like ****. with the supercharger it is making boost just revving up so it makes it worse. a turbo doesn't make boost without load so it will still rev sitting still. common things are couplers blowing off or holes in piping or couplers. check anywhere the piping could rub on anything. hope this helps.
What about fuel pressure? What pump are you running? Could the computor have gone into a "safe mode" for some reason? Try unhooking the battery for awhile and try it again. Sorry, just thowing stuff out.
Pull your plugs. What type plugs? Sounds like a misfire. I burned up 2 plugs a week after getting tuned and it did the same thing to me except I couldnt go past 3000rpms.
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car is falling flat on its face at like 3500-4k.
