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I guess if you take out the pin and bushing, and it seems loose enough, that would be the root cause. IF the pin & bushing seems tight.....hinge? just look for whats loose...
My old chevy had the doors almost falling an inch when opening. replaced everything but it was actually the body was fatigued already, so there was nothing to be done short of fabricating custom parts.
Replace pind and bushings, may habe tu cut old pins out, but kits can be gotten from ford or napa. Toughest part is stabelizing the door when hinges are apart!