Need some help figuring out why my trucks throttle body’s blowing air out the top when you start it up or when it revs up too move

 

Does it run all right otherwise?

 

Yeah but it’s loud and not quite the right sound you want to hear from a motor you pour your time into

 

What's done to it?

 

I put all new gaskets on it and fixed all the vacuum leaking got the ac blowing ice cubes and when you start it up it makes the sound and like if it revs up too drive

 

At startup, the engine should flare to about 1500 rpm, then settle slowly back to around 650-700 at idle. Does it do that?

 

It does flat up and idle back down

 

Is it actually blowing out? Or is it sucking in???? Is the throttle body nice and clean?

I 'expect' some noise from it, when IAC is open..... get a fair bit of flow noise there, but, most of that should be muffled by the filter housing.....

 

Oh it blows out probably more than it takes in

 

Then you either have a cam timing issue, or a clogged cat..... clogged cat would leave the engine WAY down on power.......