Code P0301, cylinder one has no contribution?

Hello, have you checked that the Fuel Injector is actually opening, using a stethoscope or long screwdriver to hear it opening? Also, I'm assuming you did just a cranking compression test. 120 is pretty low. The minimum spec is 119 and standard is around 170psi, that's a cranking compression test. But for now, I'd try swapping the coils around and see if the misfire shows up on another cylinder. Youve covered most of the basic bases. Do you have an oscilloscope by chance? There are some resistance specs for the coils I'll put below, I know you have good spark outside the cylinder, but coils can be breakdown under load inside the cylinders. Just so you have this information anyway. Where is the EGR valve located on this model, is it near the number 1 cylinder? There are a couple fixes related to P0300 random misfire, and it was recorded to be carbon build up in the EGR passages. Seems like you have a dead miss if it's not contributing at all. But swapping the coils around and checking for any type of vacuum leak near the number intake runner or around that area would be next to. I'll go through the TSBs and see if there is anything listed there. The first diagram below has some other possibilities for p0301. What was your engine vacuum at? There wasn't any bouncing needle at all either?

The info on the valve lash adjustment for these actually require a shim to be put in, each camshaft cap needs to be removed one at a time to put a different size shim in. I've actually never seen a design like this. Most valve adjustment I've done was on Hondas where there's just a lock nut and screw to adjust. This looks pretty complicated. It requires special tools that need to be bolted on to hold the camshafts. I'll put the diagrams and information below. But if you have a relative compression test with your scope, you'll be able to see each cylinder's compression hump and if any cylinders are low indicating a mechanical issue.

(First diagram) This is a relative compression test I did on a 06 Honda CRV. You can see the two cylinders that were low. One was a lot worse. This turned out to be a bad head gasket, but I had done a valve adjustment before, and it didn't improve. I used a high amperage amp clamp (600A) to grab this waveform, but you can actually do it right on the battery too. It will just need to be inverted. From the battery it's just measuring voltage drop from the Starter motor versus getting an amperage reading where each hump is the actual compression stroke.

But I think if the valves were too tight, they would actually be staying open instead of sealing the cylinder and you would have popping into the intake or backfiring out the exhaust.
I'd think if you had a completely dead cylinder it would have to be a coil, injector or wiring issue. You could scope the injector too and see if there's a pintle hump just after its inductive voltage spike or with a current amp clamp. I'm sure you probably already know this stuff. We just don't get a lot of people on here that use a scope.
But let me know what you find, I'm really curious what turns up.

Yeah, doing a relative compression test is very fast and rules out any mechanical issues right away. Just remember when you scope a fuel injector to use an attenuator. The inductive voltage kick can be anywhere from 80 to 150volts. I always use a 20:1 attenuator on my Pico so I don't burn the scope out with over voltage spike. If you need more information or details on those types of tests, just do a YouTube search and you can find any scope settings or voltage ranges. Looking at the Ignition coils setup, it looks like they are a smart coil type where they will receive a 0-to-5-volt square wave signal from the ECM for reference. So, the ECM doesn't control them directly, they have a built-in transistor in the coil itself. So, the ECM just controls the base signal to the transistor and that makes and breaks the ground side of the coil.

Yup, that makes perfect sense, always takes a lot more voltage to fire under compression pressures. Glad is wasn't a mechanical issue. Good news.