Pranav catches the LT1 misfire zeka

[Pranav]

Great now I've caught the bug. Quick background:

-At NOLA in may, I would've sworn I had a tiny/faint miss above 4k RPMs. Then I dropped a valve and destroyed a piston.

-Pre-Hallet, new motor, 100% same ignition, fuel injectors were tested/cleaned, car seemed to dyno fine but high RPM looked a little janky on the dyno sheet; the dyno operator had goofed on hooking up the RPM pickup initially and the car still made the right numbers so we left it at that assuming it was the pickup

-At Hallet, after getting thru the wreck and rear end swap, I noticed I had the same miss from NOLA. Just enough to bug me but barely there. Went ahead and threw a new Delphi ICM on it. Made no difference

-Post hallet, took out all of the plug wires and checked them with an ohm meter; #3 was showing open/bad so I replaced it; all 8 plugs visually looked fine so I put them back in. Built a fresh opti and put it all back together. Also went thru and checked lifter preload. Some loosened a little, a couple tightened a little. Most were less than 1/8 with a couple being 3/8 turn from where it was originally.

Ran it on the dyno today and the operator could definitely feel that same miss, car was down 12-15ish HP and TQ and the high RPM graph looks jagged. AFR was solid at 12ish like it always is.

I need to double check, but I don't think I replaced the coil. How do I actually test a coil properly? I ohmed it before hallett and didn't find any conclusive results.

One other thing to consider; I left my digital dash on in the car over night so the battery was low before heading to the dyno. The dash is sensitive to voltage and will not turn on unless the battery has enough voltage, more than what is needed to start the engine; the battery was low enough to where the dash would not fire up with the engine off; it had to be running. At running idle it was high 13 on voltage and climbing after startup, right after the dyno pulls.

What else could it be? Going to try redyno on Monday with a charged battery and a fresh coil if I hadn't swapped it already, along with swapping/fixing anything else I may find this weekend.