Ok, an update:
So as I said, I wd40'd the spark plug tubes, wire brushed the spark plugs, wd40'd the spark plug wires, cleaned the fuel injectors....And still the same shit. I touched the screwdriver on the injectors, and it was hard to tell as the rough idle shook the engine loads, but I believe all of them were clicking, so none are stuck open...
So where to now? I'll check the fuel filter & pump tomorrow but what am I looking for? And after that what are my other possibilities? I want to change the oil (keep the filter) too for safe-keeping. I think it could be what was stated about the sensors, would make sense - or a cold start sensor that's not turning off? But regardless, it runs SOOO rich...it's driving me mad. Not a single moment's rest with this thing...really getting me annoyed....