What would you check next? Missfire on my 98

[Tom]

I'm having a problem with a cylinder 7 missfire. It only happens when I've been accelerating mildly for a long time, like an uphill freeway ramp to 80mph. Eventually #7 starts missfiring, which gets worse the longer you accelerate. Let off the gas, missfire is gone.

-I started by swapping the plug and wire from another cylinder.
-Tested compression.
-Then I changed the cap+rotor
-Then I replaced the fuel injector.
-Finally I plugged in an OBD2 and watched fuel trims while spraying around the intake to cylinder head surface area with carb cleaner.

I've eliminated everything that's cylinder 7 specific. Driving around with the OBD plugged in, I can see its only cylinder 7 having any miss fires. I'm at a loss of what to check