Fuel flooding problem??? Help!!!!?

Okay,your car is def. running a rich fuel mix(Strong gas smell and black smoke),that will make your veh. hesitate and shut off,as there is not an equal mix of fuel and air.You stated that this occured AFTER putting in the f/i cleaner.Your mech. was correct in changing the fuel filter,because once you use fuel treatments,a lot of dirt and deposits are broken down in the fuel to be burned-off through engine combustion.Now here are some things to look at. #1-Oxygen sensor.Since the oxygen sensor,or o2 sensor as it's called,reads exhaust,and tells your car's computer to compensate for fuel/air mix,there is a good possiblity that after running the cleaner,the outgoing exhaust which was probably full of dirty,burned gas has clogged the sensor.If that is the case,the car's engine management will overcompensate with a higher ratio of fuel to air. #2;I would re-visit the fuel injector issue.Newer veh.(1985-Present) benefit better from a pro-fuel system cleaning that is done directly at the fuel injector valve,rather that mixing with the fuel.Sounds like you def. maint. the car,but how long was your last tune-up(Plugs/wires especially)? Find a good service center to check your fuel system.Good luck.