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Sounds like the "cold start routine" is missing its cue. The cold start sequence raises idle, and enriches fuel ratios. For a limited time during warm-up. Some cars use 2 sensors for the water temp. This means that the sensor which operates the water gauge or idiot light is different from the Engine Management sensor. So except for the flooding problem you would not know if it was working.
Did you check to see if the 4th injector was dry after replacement?
Another idea for richness is that fuel pressure is too high or that there is an air leak on the intake. This could coincide with not drawing in fuel to number 4 cylinder. Also, a lean condition on number 4 would ramp up the fuel to the other 3 cylinders as some metering systems are based on exhaust AVERAGES.
A simple test on a running engine with a spray bottle of water will produce a change in RPM once water is drawn into the air leak. This will pinpoint the problem.
If not cranks at all check the battery for charge, starter, fuses
If cranks no start check wiring(replace) , distributor cap (replace), rotor, ignition coil
Please kindly let me know if you need more info