I have a 93 mustang and I'm having issues with the fuel pressure dropping with rev. I bought the car with mods already done and no vacuum line were ran to adjustable fuel pressure regulator or EGR. The brakes were a little hard to push in at times so I ran the vacuum lines from fuel pressure reg. and EGR to edelbrock performer ii intake. The brake issue is better but now the fuel pressure drops and the car has a slight hesitation when rev. I changed the fuel filter with no luck. Any suggestions?