Maybe a 3g flywheel. Ive seen the 3g v6 crank have offset holes like that

Seems all your holes have different gaps between them

Maybe a sticking throttle plate

could also be a fuel pressure problem bad regulator, leaking injector, or fuel pump

check your alternator

you can use your stock regulator and injectors with the 190 but for the 255 you mite need a adjustable fpr depending how your car reacts to it, and your 14b can hold good boost atleast till you demand more power

true also helps reduce the pulses sent from the throttle body closing

also check free play on pedal & shift cables

when is the next mini dsm meet