Clicking sound

[Bradley965]

Hello, I currently have a 2006 Jeep liberty with a 3.7 standard transmission. Currently im hearing a dull clicking sound coming from the front end driver side. Sounds like it is coming from around the transfer case. But i can also hear it from the engine bay. Any advice would be welcome. I show 1000rpm constantly as well. Idk if thats part of the problem. Currently playing the idea of a vacum leak, faulty oil pump or my lifters getting stuck. But the sound doesnt go away even once the engine is warmed up to operating temperature.