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What engine and chassis are we working on?
And is your car bucking or is it bogging when boost hits? Big difference here, and tells you where to look. If its bucking like violently and abruptly engine braking, then your issue is fuel, as in abruptly not getting enough of it. Either injectors are too small, your tuning map is crap, or your pump is not pushing enough volume. Bucking is typically attributed to fuel cut, if you've ever experienced that before. Side note, water in the intake can cause this too.. ask me how I know.
If you're bogging, that could be any number of things from faulty MAF, boost leaks, weak spark, *broken coils*, fouled plugs, bad tune, etc. This is usually attributed to running way overly rich. Typically if your MAF isn't running right or isn't giving a signal, then your car will fire up and immediately die, but if you keep pumping the gas you can keep the car alive by bouncing the revs.
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