Non-critical engine trouble on a third gen Honda: One day last week a cylinder started missing, but problem seems to be more phantom?

. Any old Honda wonks out there? Hello everybody, I may have been a bit vain about my perky little engine when it started missing and running rough. About two years ago I replaced all the sparkplug cables, and replaced the fuel filter, the spark plugs and some other stuff. It ran great until last week. This is an '87 Honda pgmFi, 2.0l single overhead cam 4cyl inline manifold fuel injected. Two days ago I did the test where you pull the spark plug cables one-by-one until it doesn't make any difference, and that's the cylinder that isn't doing anything. Well it was the #1 cylinder all the way over on the far right, plug wasn't fouled, but I replaced it anyway, (I also replaced the ancient distributor cap and rotor) Thought the new cable might be bad, Inline spark checker indicated it was getting spark, and the cable checked out at 4.2k ohms… Runs ragged at idle speed or on level ground below 2200rpm, but kicks in and runs on all four under even a little acceleration, driving up a hill, or rpms over 2750. My guess is that #1 injector is shooting a stream and not a mist, but a little timing advance (under acceleration) or more compression (up a hill) is enough to ignite even messy gas. All of the injectors are clacking the same way in time, and the inline spark checker seems okay for all plugs. I filled the tank with chevron 93 octane with the recommended amount of ***MORE***

Added (1). recommended amount of Seafoam for injector cleaning and moisture/ethanol concerns, and may replace the fuel filter again after this tank, (though it's only gone 22k miles.) Oh, when the system pressure comes up, the pgmfi light doesn't go out like it should (that's the precursor to the uninformative "check engine" light that everybody has these days)

Added (2). HI again, You ought to know that all the gear; cables from the ignition coil to the tip of the spark plugs is brand new, between four months to four days old. [on 10/3/19]This includes: All new cables from Autozone (4 months), new rotor, new cap(4 days old) 3 new spark plugs(4 months) 1 new spark plug (1 day old) new air filter (three weeks)

It's probably a bad or fouled injector.

You should replace the fuel and air filters at least annually regardless of mileage. 22k is too long.

You should inspect and / or replace the distributor cap and rotor annually.

You should clean and PROPERLY GAP the spark plugs at least annually.

You'd be wise to use a fuel treatment every 10th fill-up.

All more often under hard use.

Low compression on the hole that's missing. The very first step in a misfire diagnosis is a compression test. Honda was famous for valve clearances that got tight. If that happens on an exhaust valve it will burn in short order.
Do not spend a dime until you confirm compression, after that I'd be looking for a vacuum leak on that intake runner. Spray carb cleaner where that runner meets the cylinder head, if it smooths out you have a bad intake gasket.

You can only use NGK or Denso spark plugs in a Honda. All Honda motors have a common issue with the valves getting tight and they must be readjusted every 60,000 miles. Vain? If you don't know how to diagnose a misfire or fix it find a mechanic.

Have the valve adjusted.