Ωhm

If true, something had your throttle plate held wide open (WOT).

_mj1988electricalmanual_1.pdf pg48 - Cruise Control pg80 - C253 pinout Maybe it can help here.

Check and make sure that the drilled hole for the spring pin alignment is in the same location on both gears.

If your misfire just showed up one day, I’d wonder if that gear jumped a tooth.

Maintenance items.

Thanks, on those fuel trim values. As you already mentioned, ST&LT read outs look good. Good call on possibly an ignition problem. If you haven't moved your distributor, it should be ok but still look at indexing (cruiser tip #13).

Should have asked earlier, what are the Fuel Trim values (ST&LT)?

Sometimes a kick and a buck are caused when ECU drops out of Closed Loop (LP) for an instant period of time. See if that correlates with the REM.

True. No ECU control. Vacuum sourced at the Air Cleaner (fresh air in).

Charcoal Canister is vented to atmosphere on its bottom. _fuel evaporation system.pdf Charcoal canister servicing, what's inside + new filter @Airborne Janitor

For "Max A/C or Norm A/C" use note number (5). I'll join you here, truth table is difficult to read, let alone understand. My gut tells me, default (no vacuum) is water will flow through the valve for no other reason than safety concerns (defrost mode).

Check you sender (back of block). Disconnect wire. Connect DVOM (top of sender to battery ground). Look for resistance (Ω's) values as follows. Compare reading to IC gauge.

There’s a reason why it’s called an idiot light.

Did you inspect/clean the 2.6mm orifice?

Bummer on that O2S. Results should have been immediate.

That t-shirt, is that QR code cube?

Resistance (Ω) is futile. Request new username "one of many".

It all started with the pocket calculator. They said it would ruin my generation (boomer). We wouldn't be able to add or subtract. Now we must comply.

We will learn to love AI. ☺