So another thing after fixing my 4 wheel drive today I noticed after I started my truck I herd a loud air rushing sound from under the hood and the truck seemed like it was caughing almost from the exhaust. Cats only about a week old with new o2s and I changed the idle sensor as well. Any ideas on what's going on?

 

Also when it did this I tapped the gas and it went away and didn't do it right away after

 

May just be air in the throttle body. There isn't a big opening, and the engine sucks a fair bit of air, even at idle.

 

It Boggs down a lot when I hear that too. I've never heard it before too

 

Question becomes, is it a cause, or an effect.....

 

i hear the same sound on mine when i first start it in the morning,i thnk its the IAC solenoid being fully open on start up(sounds like a vacum leak),then after a few seconds it closes and finds its position..but,i could be wrong..