Gas is flooding thru throttle body when trying to start

Check fuel injector fuses. With the key one you should have power to the injector plug. You could have (gas) fouled out spark plugs. Or timing jumped.

Check the oil. Quite a few cars do that when they are low.

Sounds like your coolant temp sensor went bad, it is in or around gooseneck /intake area 2 wire plug yellow/brown if I remember right this regulates fuel according to temperature so basiclly it tells ecm how much fuel to send to throttle body for how cold it is out. these go bad and cause a -40 *F which pours raw fuel down intake thus flooding,

have you checked the needles or floats in the carb?

Sounds possible to be a bad TPS (throttle position sensor). This should be located on side of throttle body and monitors where the throttle is, it sends this information to the computer and thus sends to pump to either increase or reduce fuel supply to injectors...If it has malfunctioned in the wide open position, it would be continuously feeding to much fuel to the injectors. Foolow the throttle cable up to throttle body....opposite of the throttle side should be a sensor with an electrical connector...this will be the TPS.

Check the fuel pressure. Even if it's running it may not be producing pressure. See if you can keep it running on starting fluid or carbuerator cleaner. If so replace the pump.

Your description indicates that the fuel pump may be too weak to start the vehicle but has enough fuel pressure to maintain running once it is started.

A flooded engine will never start. Pull plug or plugs if they are wet. Check for spark too.

Tried changing the fuel filter? If that's not it it could be a bad pump

try the crankshaft sensor. it is on the transmission bell housing on the passenger side. You could also check for codes by turning the key to the on then off 3 times (DO NOT START THE ENGINE) and it will give you any stored codes in the mileage display