IAB has a constant loud hiss, idle does not change when I unplug the harness from it.

[rjrobin2002]

Found my problem when I pulled my intake hose off. This adapter had sucked into the throttle body and was partially covering the IAB making the sucking noise. I have not driven it yet.

 

[rjrobin2002]

I can't believe nobody guessed I had a baseball sized piece of rubber stuck in the throttle body fixing to be sucked into my engine.

 

[Justafordguy]

Well that would certainly cause problems. Where did it come from?

 

[Viperwolf1]

I'm guessing china.

 

[rjrobin2002]

Advanced Auto Part store hose. I mounted the Explorer factory air box where the original Bronco battery was and used this generic hose to connect the throttle body to the MAF on the explorer air box. I did not check to see if this adapter was stuffed inside.