lord of the z

I have an auto 87 N/A 300zx 2+2 after the trans went out we let it sit for a week, when we went back to start it it ran fine for about 5 minutes. when we put it in reverse it started sputtering and died, we were able to get it started again, but it just got worse until it didn't even try at all. it's getting spark, its getting fuel, the injectors are pulsing, the ecu is showing everything is fine. it smells like its getting flooded, we did an oil change and it smelled like gas, we unplugged all the injectors and got it to fart a little. any help would be appreciated.