Update:
returned to customer this AM and everything that was posted here checked out ok....I removed the Model J and replaced it with a COBRA Regulator.....started and ran truck and drove it for over 45 Minutes and it ran good....I did notice one thing while replacing reg.....the customer installed a copper feed line from the VFF30 Lockoff over to the regulator and this line is only about 1/4 inch told the customer they might want to put a bigger line on it..........Will repost if this truck starts acting up again( SURE AS **** HOPE NOT!!!!)