Since my April track day, I’ve been having frustrating back fires and weird times. After giving up on everything else, I think I found my vacuum leak... Decided to smoke test the intake system just to see what my random misfires were. I changed all O2 plugs and did a whole rebuild on the CCV. Turns out I did the refresh right. Valve cover is cooked.
Also, I’m in love with my homemade vacuum leak tester. Simple and saved me a helluva lot on shop diagnosis.