vacuum leak or brake booster vacuum leak
Ive had a vaccuum leak for about a year already. I have replaced my intake manifold and gaskets with felpro gaskets and oem ford racing I/m.ive clamped all the hoses running off the cold air intake and the 1 f4om the pcv valve to valve cover. Car idles perfect and runs perfect. The vacuum leak sounds big real loud hissing so I cant understand how I would have no idle issues. Im starting to think it might be a brake booster vacuum leak. I do get a light hissing sound (seperate from initial leak hiss) when I step on the brake pedal. Any ideas?
04 gt. Mach 1 lip, grille delete, k&n cold air intake, 40 series flowmaster cat back, steeda tri ax short shifter