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Flames/popping between shifts, or, on decel, is typically caused by a MAF overrun.. When you close the throttle, the turbo will keep drawing in air for a second, and even if recirculated, you will get some overrun, typically. When this happens, the throttle is closed, and for a split second, the MAF tells the ECU, to spray fuel when it isn't needed.. The engine flashes rich for a second, between shifts, and you get some raw fuel into the turbo. When it meets with enough fresh air to attain the right mixture, it will explode.. making a small pop, and sometimes, flames out of the muffler.
Travis
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