i bought a p28 thats chipped and tuned with chrome, i was running on a p06 and the car runs good, just with the p28 it should run better

when i put on the p28 it doesnt want to go over 4 rpm, and the acceleration sucks, wat could it be? what i need? my friend told i might need fuel pressure regulator, becuase the ecu is asking for more fuel to be sent, could that be it?

OH AND BY THE WAY ITS A STOCK B18b1

If u guys have suggestions, or any advice, just lmk