Guys I replaced the Fuel Pressure Regulator, and now theirs a louder sound I can hear, it almosts sounds like its behing the motor, its rather audible and annoying in the car(almost a tick/knock) noise. Still seems to be running funny, almost sounds like an air leak somewhere near the Throttle body, is it possible the seal or whatever between the TB and the intake has a leak?

Anyone have any idea? If I hit the gas real quick and let go, the idle drops so low it almost dies then it picks up...Only sometimes though(doesnt do it every time)