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Run for a while then stalls on 1990 Dodge W150

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The truck will run for a little while then stall out. with my genisys hooked up I can watch the data stream and the battery volt will drop to 0, the RPMs drop to 0 the air intake temp and coolant temp bounce from normal temp to -198, have replaced the pickup coil in dist, coolant temp sensor, O2 sensor, tried a different computer, nothing helped. HELP please
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no I have to shut the switch off and then cycle it a couple of times and then it will might start and run or just start and then die again
When it stalls if you could check for ignition fire that would help narrow it down a bunch!
IT HAS FIRE IT IS LIKE IT LOSES FUEL, I CAN SHOT SOME CARB CLEANER INTO THE THROTTLE BODY AND IT PICK BACK UP AND THEN START TO STALL AGAIN.