If the “sock filter” below the submerged fuel pump is plugged with crud it will cause hard to diagnose stalling.

Check the EGR system to see if it is flowing at Max and keeping the spark from igniting a low oxygen mixture.

Having the paper 1994 or 1995 Field Service manual really helps with its flow charts trouble shooting section. Well worth the money.

https://www.ebay.com/itm/1995-Dodge-Ram-Van-Wagon-Shop-Manual-B1500-B2500-B3500-Repair-Service-Book-OEM/362515008614?hash=item5467940c66:g:P0IAAOSwL5BZ1Xyo

The Actron Scantool CP9110 with the Chrysler cartridge can read the OBD-I system.

https://www.ebay.com/itm/Actron-ScanTool-CP9113F-89-95-Chrysler-Cable-Software-Cartridge/113603400055?epid=1762509062&hash=item1a734a5177:g:TfYAAOSwQGFcT5oF

https://www.ebay.com/itm/Actron-ScanTool-Ford-1984-1995-Cars-And-Trucks-Diagnostic-Repair-Code-Scan/292589731943?hash=item441fb50067:g:6M0AAOSw-8pbdJu6