2005 G35 coupe TT issues...
 

Hey guys thanks for any advice you give, it's much appreciated! I have my 2005 get for years and added the Greddy tt td05h a couple years back with no problems. Last year I started running into an issue, where if i revved my engine or hit the gas normally and suddenly hit the breaks car would almost stall out. My A/F ratio would go from 14.5 ish to a completely 10 and stall out. As any normal person would do I looked for possible causes, found cylinder 5 and 6 had oil and I replace gaskets, valve covers, spark plugs, DeatschWerks 600 cc fuel injectors, and a new mishimoto intercooler (cracked my greddy one...). After all that the problem persisted, so I took it to my mechanic and turbo guy for rebuilt. I got all new piping and silicone hoses because one turbo hose had a hole burned through from the greddy header which also had a crack on it. So :32: I finally got all that fixed and rebuilt. Problem is still not solved at all, it's worse now. If I accelerate past 1500 rpm and for any reason let off the gas or hit the brakes the A/F jumps from about 14.7 to 10, leans out and stalls. So I recently changed out the throttle body, and maf but it didnt help at all. Any help will be greatly appreciated, thanks in advance!
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Fuel pump good?

Yeah the fuel pump is brand new, I finally figured out the issue. It was the hks blow off valve dumping all the air at low rpm, making my car run rich and stalling.

That was gonna be my second recommendation. No boost no fun!