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Q: Truck run fine at start up, then dies, weird computer readings. on 1990 Dodge W150

Rookie cbe0621eac06868b3efe0d8d1d3611e23c60d3114864ea2ec19a68cfbd3eebab
The truck run when first started, will idle for about 30 seconds and then dies. I have my Genisys hooked up and the coolant temp and air charge temp will go from normal to -198 degrees, the battery voltage will drop to 0 and the RPM will drop to 0 then they all go back to normal, then drop again. Have replaced the temp sensor, the hall effect in the dist and the O2 sensor. Have no idea, please help. It will start back up but I have to cycle the switch a couple of times then it will start and then die after a couple of seconds.
No car image 94a1663db56199c5353592009e34aaa51078a2469bed068bb8d6f0ba43accf97
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