Strange Noise From Engine

[SWDoodle]

Guys, had an "intresting" noise coming from the left hand side (drivers side) of the the engine yesterday I have never heard before. I left the pickup running to check the tranny fluid level and I noticed there was, as best I can describe, like an air leak sound. It wasn't an exhaust leak as I got up into the engine a little bit and it was definately sounding like it was coming up towards the top of the engine up by the intake/heads. Sounded almost exactally like a tire slowly losing air. Wasn't real loud, but you could hear it over the idleing engine. I couldn't hear it inside the cab. I was thinking vaccum leak, but isn't that primarily on carbeurated engines? I haven't noticed any loss in power, but my mileage lately seems to have dropped some. I felt around the engine and couldn't feel anything leaking. Strange. Any ideas?

[billscustomintakes]

Guys, had an "intresting" noise coming from the left hand side (drivers side) of the the engine yesterday I have never heard before. I left the pickup running to check the tranny fluid level and I noticed there was, as best I can describe, like an air leak sound. It wasn't an exhaust leak as I got up into the engine a little bit and it was definately sounding like it was coming up towards the top of the engine up by the intake/heads. Sounded almost exactally like a tire slowly losing air. Wasn't real loud, but you could hear it over the idleing engine. I couldn't hear it inside the cab. I was thinking vaccum leak, but isn't that primarily on carbeurated engines? I haven't noticed any loss in power, but my mileage lately seems to have dropped some. I felt around the engine and couldn't feel anything leaking. Strange. Any ideas?

Hi, could there be leak around the intake tube and the throttle body? Check on the bottom side of the plastic intake tube I have seen them get damaged.