I just put the trick flow intake on my car everything was good for a day, but last night my injector above cylinder 4 started to leak. When i would turn the ignition to the battery on positionu could hear the injector leak and squirt. I took the injector out and saw that the o-ring had a chunk missing. I replaced it with a new o-ring i got from autozone. Now i have the car back together and no gas leaks anymore but when i turn the ignition to the battery on position i hear the humming of the fuel pump doing its thing, then sometimes an air hissing noise. Is this hissing noise a leak or is this the fuel pressure regulator making the noise? My parents mountaineer makes the same hissing noise in the same spot.