I own a 98 zj 5.2 V8
When I seem to sit at idle for 30 seconds or more, it wants to spudder and the intake sucks in more air when this happens. But then it jumps out of it and revs up a few thousand rpms then stops and goes to normal. It does something kinda similar when taking off sometimes. It likes to spit and spudder for a short period of time. Then I get a knocking noise and the whole engine starts knocking. Then it jumps out of it in a few. It's getting to be a real problem lately and I need an answer for what is going on so I can fix it. Thanks.

 

It's possible the engines sucking air from a source it should not be. One quick test is to start grabbing vaccum lines with the engine idling with a pair of pliers and see if the noise changes. If it does, that's where your leak is coming from and you can trace it forward and back on that line.