After changing a few things, and running my car for a week or so I have noticed that I have a tapping on the left side of my engine if you were looking from the front. while idling it taps along with the engine speed. IT continues on up through the RPMS until about 3k then either the engine drones it out or it stops. I'm thinking it's an issue with a pneumatic lifter. Anybody got any ideas or input on what it could be and how I fix it?