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1993 Cadillac Seville fuel delivery system failure! Help!

My question is, does anyone know exactly what would be causing my car to shake vigorously upon acceleration, occasionally, when warm, with hesitation and fuel smell, like the car is choking with too much gas, is it fuel injectors? fuel pump? fuel line? Even the dealership can’t figure it out, after an entire week!

I would check the fuel pressure regulator. You probably have the type which uses intake manifold vacuum as a reference, so there is a hose from the regulator to the manifold. The regulator can develop an internal leak and dump raw fuel into the manifold.