02 durango vacuum leak?

[azdurango]

i have a question about the 4.7 v8. i was hearing a air leak when the engine was idling, when i tracked it down it was coming from one of the ports behind the "hat?". both ports had a cap on it,but 1 of them was cracked. when i put my finger over the port, the engine would start to choke. it seems like at idle this is the only air the engine is getting.
when i take both caps off the idle speed goes up.
at idle i noticed that there was no air being drawn in from the air filter. when the engine is revved it does draw air.

is this normal for magnum engines?

 

[RamV10]

Sounds like an IAC issue. No it isn't normal for any engine.

 

[azdurango]

i didnt think it was. what is the large square part on top of the engine?

 

[dodge dude94]

Sounds like you have a combination of a vacuum leak as well as an IAC valve failure on your throttle body.

I would be removing the air hat and throttle body to inspect closer for anything else that's broken.