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The injectors need to be tested for pulses between the two wires (not to ground or +12) with the engine turning. With it still, you will get almost the same reading (only noticeable if you use a meer) from both wires since the injector has a coil of wire between the two terminals. The electronics may float between ground or +12 on the wires depending if they are powered up or not.
Do you have the appropriate pressure at the fuel rail? A V6 takes a lot more pressure than the 4 cylinder cars.
You need to do a little detective work here. Based on your question it appears the engine is not getting gas. You changed/cleaned the injectors, yes. Do you test them somehow to see if they were actually squirting fuel. In the injector system the fuel pump fills and holds constant pressure on the fuel rail. The injectors get their fuel from the rail and an electric pulse causes the injector to open for a split second to shoot fuel into the cylinder. If you have the right tools you can test the fuel rail pressure to see if the pump is actually delivering fuel and pressure to the injectors. If so, you need to verify that the injectors are being electrically "turned off/on" to squirt fuel into the cylinder. Usually you can hear them clicking when the engine is turning over before it starts. It will be clicking pretty quickly but you can hear it if you get close. You can also put a screwdriver (big one) by your ear and touch the metal end on the engine near the injector. The screwdriver acts as a poor mans stethoscope. Try it it works, just be careful you don't touch anything electrically charged! My thought is that the fuel pump and fuel delivery system is not getting fuel to the injectors. Could also be caused by a dirty( maybe plugged) fuel filter. You said the fuel pump was not running, that should be a big clue to the final problem. Look for fuel to had dried or jelled when the car was sitting. Fuel doesn't stay in good condition very long and the injection system uses very small ports so they can become clogged pretty easily. hope this helps, good luck, worm1855
1) Running fuel pump to remove water from tank will likely not empty it all, but it might help. Will still be some liquid in bottom of tank.
2) More than likely, the gas has gummed up and is no good, While your draining of the tank will help, may still need to change the fuel filter and clean the injectors. The ability to keep engine running while pouring into the intake is a good sign, but mayfind that more parts need to be cleaned and replaced prior to solving the problem.
I believe in that era G.M.had what they called their H.E.I. and it was .060, check on radiator top or in engine compartment or its in the owners manual or better yet call a G.M.. dealer they'll know for sure
The idle air control valve may be at fault, also the throttle position sensor may be telling the engine th wrong information and sending too much fuel, a couple other ideas come to mind but I not an expert. A faulty injector is one of them.....I another idea that may help as well: Vacuum Leak: The ECM will try to compensate for leaks up to a certain size. This will cause the ECM to compensate and possible send too much fuel to the engine...???? Good Luck