I often hear my engine when idling at an erratic tone. The tach doesn't move at all. The exhaust will also pop at an idle occasionally. Does anyone else have this going on?

 

Yeah

 

Got any mods on it?

Dusty

 

Just a jmb catch can and some lights.

 

I've had this same sound and it turned out to be a bad injector. Check your plugs and look at the color of the tips, you should be able to see witch cylinder is lean. If they all look the same, good, it's something else. Just a thought.

 

Mine does the same but very slightly. U really have to be listening to notice it.
I figure its due to a twin cam set up / timeing and all that shiz.

If it is pronounced aka very obvious then i would think there is a problem.