Puffing noise. Not exhaust leak.

I recently broke the throttle body by accident so I replaced it with a big bore one for LC Engineering. Now there seems to be almost a puffing kinda noise if I put too much gas in it as i accelerate. The more you throttle while accelerating the louder the noise gets but it is not there during idle or coasting or even if I rev it up in neutral. I took it to get checked out with a mechanic and he said that it idles at spec and that he couldnt see anything wrong with it and that he thinks its just caused from the new throttle body. I called LC and they said that the throttle body shouldnt cause any new noises or any problems. So im pretty stumped on this one can someone please help me out.

 

what year is the truck? and you ever get it resolved.

 

I have checked the vacuum lines and they all seem ok. I did have the negative disconnected at one point but maybe it wasn't for long enough. The guy I took it too said that it idles at spec and thinks its noise from the intake but it def doesn't sound like an intake noise. It almost sounds like an exhaust leak at the headers to block but ive checked that and it seems to have no leaks.

 

and its a 99 Tacoma with the 2.7L 3RZ.

 

Did you find a solution to this puffing noise? Im having a similar issue and cant find the source of it. Seems like a vac leak but i cant find it. 04' 2.7l

 

I ended up cleaning up and putting my old IAC valve that I had just replaced back on the throttle body and the puffing noise disappeared! Parts just arent quality anymore