2017 ZL1 with H/C/LT and 2300. Cylinder #3 has started reporting misfires. It is fine at idle and high rpm, issue exists mostly around 2000-4000 rpm. Issue is worst when cold and goes away nearly completely when up to temp. Have already:
- replaced plug
- replaced plug wire
- swapped coil pack
- inspected under valve cover (didn't observe anything like cracked springs or hot spots on top of valve, everything's tight)
Take a listen while watching this log go by and see if you can come to a conclusion:
Attached is a photo off log when car is fully up to temp, notice no more misfires comparably.