I still have an issue with hesitation under acceleration. After 3k it cuts power. Around 4500, the engine is pulsing kind of like a miss. I've replaced the wastgate diaphragm, and got corksport intercooler pipes. I thought the bypass valve might be leaking (I know this sounds weird) I put super glue around the seam. The only other "mod" was replacing the air box with a k&n cone filter. No vacuum leaks that I can find and I don't know if it's been reflashed and don't know how to tell. My next step was to see if the intercooler is leaking. Outside of that or the fuel cut, I'm at a loss. Any suggestions?