so they rebuilt your old ecm and sent it back to you? its possible the ecm coil driver went bad and it just wont work even if the caps got replaced. if you are getting fuel the distributor should be working. the ecm uses the signal from the distributor to work the injectors and the ignition. sense you are getting fuel its not the distributor.

it looks like you need a new ecm. grab this one https://www.ebay.com/itm/1991-1992-M...wAAOSwPqleKYmd

and follow this guide: http://www.mightyram50.net/vbulletin...+ecm+swap+Info

dam, time sure does fly.