92 voyager backfires wont start

92 plymouth voyager starts once and idles fine for about 5 minutes then stalls out and wont start has fuel and spark but backfires through the exaust like its trying to start, disconected the exaust to see if the problem was the cat converter (plugged) but was not the problem.new fuel filter.runs great once a day for about 5 minutes then stubles and dies any points in a direction is greatly appreciated.....3.3 with distributorless

Crank position sensor or cam position sensor. The stalling can be caused by either. Try them first if that does not work then the only other item would be ignition module and coils.

had the same problem with my 90 dynasty with same engine 3.3 and I changed the cam sensor and ran like a dream