Right now I am running a stock d15b7 in my hatch. The fuel pump is a walbro 190 lph that is in there for my gsr motor which is out for a build. The b7 really boggs and misfires at low rpm under part throttle. Under more than half to full throttle the car runs fine. Another thing is that the car has been getting like 24 mpg in the city and like 29 the highway. Before the gsr (and fuel pump), the car got over 40mpg easy on the stock b7. Could the fuel pump be overpowing the stock FPR causing fuel to literally mist out of my exhaust at idle? Is this even possible?