91 chevy lumina 3.1 starts but when reaches operating temp dies

On electronic fuel injection pumping an pumping an pumping the gas pedal does nothing without the engine running ! Pushing the gas pedal to the floor will cause the PCM - engine computer to go into clear flood mode .

You have some very interesting ideas here , but not really how it works or is !

The vehicle will go into closed loop fuel control when the engine coolant temp reaches a definded temp an the O2 sensor get hot.

She would run for a couple minutes and die which is open loop when running, closed loop is when the sensors kick and it would die. Pulled spark plugs, they were black meaning no spark. Can only be 2

Black spark plugs indecate a rich condition , over fueled , wet spark plugs indecate no spark .

I also have a 91 chevy lumina with the same problem, have replaced the coil packs, throttle sensor, crank sensor and new spark-plugs and still the same problem. Also how many wires connect the the crank sensor as I have two wires that are discconected. Any help will be will better than replacing parts that I don't need to. I am disabled with MS and my car is my legs!!

Thanks Diane

Sounds like a fuel pump issue or the coils are going out.

Check for a stuck open EGR valve,it will have to be removed to be checked.Or you have a large vacuum leak,either one will increase idle and fuel causing hot cat and high idle.

replace the ignition control module.

Does the low coolant light come on?

swng,
1) Is the service engine soon light ever on when engine is running?
2) Per your description I would look at the ECT sending unit. It sends coolant temperature information the the Engine Control Module for proper fuel delivery for cold engine start. It may have lost its calibration.
Let me know.
Regards,

You have a TransMission Problem..It's Called a "Torque Converter Lock-up solenoid" ..

When the Engine is cool the solenoid is not being used,
When the Engine is Hot, the solenoid Kicks in and makes your Chevy Run like your pulling an 18 wheeler.

Wait till the Engine is Cool, Slide Under your Van, Drivers side near the shifter is a 4 wire Plug.
Un-plug the wire and see if your trans works after it's hot.. your just by-passing the solenoid BUT I have never found a use for it my self..

IF you still get Lock up after this, you are stuck bringing to a trans shop or see if the solenoid cam be removed without ripping the whole trans apart..

ignition moduel were bad so were cats, dont rule out fuel filter or pump

No your thermostat is stuck open which will not hurt the engine. but needs to be replaced, the thermostat is what allows the engine get up to operating temp. before allowing water to flow through the radiator and when it is stuck open it doesnt allow the engine to reach operating temp. so the heater never gets hot. I hope that helps you out.