I dunno what the noise could be it it kids comes and goes as it wants I was parked and I heard the noise so I popped the hood looked couldn't tell where it was coming from precisely but after about 10 min of seaching it stopped and didn't make the noise for a about a week now it is back it goes away when I press on the gas and is alot louder when I am idling I dunno what to check?

 

Check for any vaccum leaks, I had one from the intake manifold by the brake booster vaccum. The jeep did'nt run any different with the leak.