"...gas will spew out of ALL of the holes at the SAME time?? Remember, I'm thinking distributor here, as in only the cylinder that needs fuel is getting it. Like the spark from an ignition distributor. Is that concept wrong?"

Yes. Actually, the fuel distributor allows individual metering of the differential fuel flow rate to each injector, but I have seen no posts here implying anyone has tried to fiddle with this. I imagine the new ones are pre-adjusted for equal flow rates. In any event, there are numerous minute passages and slits, sliding and valving parts, and strainers inside. Lots to gum up and wear.

Note that in the same way, exhaust headers could be referred to as an 'exhaust distributor', i.e. a pressure flow-tuned distribution system.

Steve

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'91 MB 190E 2.3
'08 RAV4 Ltd 3.5
'83 Lazy Daze m'home 5.7