Who here runs the Edelbrock Pro Flo 4?

[Dino]

I may have transmission issues, but the EFI portion seems to work very well. The one issue I have is that it makes a really loud and annoying whistling sound at the throttle body at certain times. Not like the flow you hear when secondaries open. I really hope having the hood back on it quiets it down enough. How's everyone else doing with it?

[b5blue]

Could you be hearing a vacuum leak? 

[metallicareload99]

I have FiTech, but my IAC seems pretty loud @ times (when cold  ) but I never notice it when I'm in the car

[Dino]

Could you be hearing a vacuum leak? 

No it's definitely the IAC. It's at certain throttle positions only.

I have FiTech, but my IAC seems pretty loud @ times (when cold  ) but I never notice it when I'm in the car

My IAC is loud untill the engine warms up and it goes down to 5-15%, where it should be, but then it makes noticable noise when driving.

[Derwud]

I have the Pro-Flo 4 (Tuned Port Style) on my 540, and my 360 and a I installed one on my friends 440 and all three have a slight whistle from the IAC during warm up and at lite throttle..