I have a car with a fuel injector staying open (probably bad), this causes a flooding of the engine.

If the injectors are stuck open, the control to them is faulty.
Probably a bad earth wire on the ECU for the engine management.
Unplug the injectors to check they hold pressure. If they, do look for the cause. If they don't, don't waste your money, rebuild the engine.

ever look at those old bad spark plugs
see tip s black and gap so wide my bill of my cap fit there, omg wrong.
or its flooding
when did this old truck run perfectly
never seen it.
last month, last year, last decade?
I can name 50 causes of stalls.
can the stall be avoided with fast right too, (zero tools test)
bad engine,bad spark and bad fueling are the macro causes.
leaking injectors
clogged injectors, or partly
FPR when bad and fuel pressure way way out of spec PSI, covered in the service manual this is and the injector balance tests. and leak down test
all shops know all this and know what tests to do.
gee 29year old engine is compression 150psi and up and near equal?
then spark checked, and spark tips clean. no oil, no carbon , no coolant on tips
and last fueling checks, got tool;s?

lots of causes and tests.
so it does start/run,
but not told is can you keep it running with fast right foot actions?
3causes, common, (not engine bad,)
spark dies. (spark plugs wire set, rotor cap and or whole dizzy.
lean fuel, PFR bad. low fuel pressure
to rich fuel floods and stalls, same as above FPR bad.
a tech has tools to test all that, every bit. in fact.
no tools means wild guessing and even adding more bad parts.
a timing light would show spark dies on all cylinders tested
using WOT cranking to clear food
also BAd FUEL OR A TANK FULL OF RUST, SEEN ON ALL 88 CARS IF COULD SEE THEM ALL.,
INJECTORS LOVE TO CLOG IF BAD FUEL OR RUST IN THE TANK.
WHEN DID TRUCK RUN RIGHT, LAST DECADE? HISTORY MATTERS HUGE ON OLD CARS.

Suspect (potentially) either a stuck injector, or a failed/failing fuel pressure regulator. One sign of a failed fuel pressure regulator can be gas in the oil. (I suffered that side effect, along with bogging, and black smoke rich running, worsening as warmed up, turned out to be fuel pressure regulator). If the injector is loose in the throttle body, or has bad o-rings, can also cause some wonky behavior. Good luck.

Probably fuel pressure issue. Check for leaks, dirty filter, low fuel pressure could indicate bad fuel pump. Normally, a float would cause flooding, but a clogged jet could cause a lean / no start issue. Try some gumout fuel cleaner and a gumout spray clean of the carb and linkages before you get to far into a part issue.

ENGINE FLOODING COULD BE CAUSED BY FAULTY FUEL PRESSURE REGULATOR.FAULTY MAP SENSOR, WEAK IGNITION SPARK.DIRTY FUEL INJECTORS LEAKINGSTICKING OPEN. FLOODING OUT ENGINE.CLEAN THE FUEL INJECTORS AND CHANGE AIR FILTER.

An engine will flood if there's too much fuel going in because of a stuck choke, a bad spark not igniting the fuel, failed temperature sensors, bad fuel regulator, timing...the list goes on.

The amount of fuel delivered to a properly functioning injected car is determined by sensors mounted throughout the vehicles air intake system. These sensors work together along with the ecu to control the fuel / air mix delivered to the cylinders.

We would need to isolate the components that have impact on the duration of time the injectors stay open. In troubleshooting it is often best to work backwards.

1. Injectors - Are they leaking? 2. Pressure regulator - is the pressure at the fuel rail the right pressure?? (40psi for most fuel injected cars) 3. TPS- throttle position sensor- is this reading accurately...there are several different styles of these 4. Air flow meter - these also come in several varieties varys from mass air sensor / simple vane meters. 5. during startup there is a seperate circuit called the throttle bypass valve - this also may not be functioning if the flooding is occuring rapidly during startup. If the car starts and runs for a while than floods. this is probably not the culprit. 6. ultimately the ECU could have a problem as it is the link in the chain that ties everything together....though not likely. Any of these these would have the potential to flood a vehicle if they were not functioning properly. The amount of fuel delivered to a properly functioning injected car is determined by sensors mounted throughout the vehicles air intake system. These sensors work together along with the ecu to control the fuel / air mix delivered to the cylinders. We would need to isolate the components that have impact on the duration of time the injectors stay open. In troubleshooting it is often best to work backwards. 1. Injectors - Are they leaking 2. Pressure regulator - is the pressure at the fuel rail the right pressure?? (40psi for most fuel injected cars) 3. TPS- throttle position sensor- is this reading accurately...there are several different styles of these 4. Air flow meter - these also come in several varieties varys from mass air sensor / simple vane meters. 5. during startup there is a seperate circuit called the throttle bypass valve - this also may not be functioning if the flooding is occuring rapidly during startup. If the car starts and runs for a while than floods. this is probably not the culprit. 6. ultimately the ECU could have a problem as it is the link in the chain that ties everything together, but it's not likely.
This is just a list of things that could cause your car to flood!

The engine is probably flooded (Way too much fuel) If the fans are running all the time, it is usually caused by a bad Engine Coolant Temperature Sensor. This will also cause the injectors to open all the way and flood the engine. Replace the Coolant Temp Sensor, then hold the throttle all the way to the floor while you crank the engine. This puts the computer in "Clear Flood Mode" and will shut the fuel off so the excess gas can get out of the cylinders. This should make it start.

IF CAR TURN OVER NOT CRANKING AFTER A SHORT DRIVE WHEN ENGINE HOT.DIRTY CLOGGED FUEL INJECTORS FLOODING ENGINE OUT.CLEAN FUEL INJECTORS.FILL GAS TANK UP.PUT A CAN OF SEAFOAM IN FUEL TANK.DRIVE CAR AROUND TO HELP FLUSH OUT CARBON ON THE INJECTORS SEATS TO STOP GAS DRIPPING CAUSING FLOODING.IF CAR WONT TURN OVER.BAD BATTERY CABLES OR STARTER.SCAN IT FOR THEFT SECURITY PROBLEMS. IF STARTER TURNS OVER NO CRANK ENGINE FLOODING DUE TO DIRTY FUEL INJECTORS.

SOUND LIKE A INTAKE MANIFOLD LEAK.WHICH WILL CAUSE BACK FIRING.FUEL INJECTORS COULD BE STUCK OPEN DUE TO CARBON BUILT UP ON INSIDE OF THE TIPS.TRYING CLEANING INJECTORS ADDING A BOTTLE OF FUEL INJECTOR CLEANER IN A FULL GAS TANK.ONCE YOU GET ENGINE STARTED DRIVE TRUCK AROUND TO LET THE INJECTOR CLEANER CLEAN INJECTORS.IF THIS DONT WORK.YOU COULD HAVE A BAD INJECTOR STAYING OPEN.HAVE TO BE REPLACED.