This past weekend at Road Atlanta I had a new problem that seemed to get worse over the weekend. The problem develops when the engine is hot and starts around 5K RPM. The problem is intermittent but showed consistency in turns 2, 4, 5, and 11. The problem would also pop up from time to time between 7 and 10A. This is my video from Sunday's race that shows the issue beginning during the first lap. Keep an eye on the tach in 11 near the end of the video that shows the worst.
I changed the coil pack, wires, and plugs before the race with known good parts (stole them from a friend running DEs) but that was not the problem as we put my parts on his car and he didn't see any of the same symptoms. My best guesses right now are fuel pump or cam sensor.
Another symptom is that I am getting a lot of noise into my tach wire that goes to my traqmate and autometer gauge that makes the tach jump to 10K during the engine miss. The tach wire passes near the coil pack so that may not be directly related.
Any help would be greatly appreciated.