Hi i got a 92' f-150 XLT 5.8 and its been making a weird hissing noise from the engine bay so i traced the noise to a vacuum hose or what i think is a vacuum hose near the back left of the engine if your looking from the front near the ac. Okay now that i told you whats wrong can you tell me what this hose more of a place were a hose is posta be is ill try to included pics later