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it idels fine then once it warms up and your going down the road it boggs down and stalls,then starts right back up and samething happens,so while i was driving and it bogged down i switched fuel tanks and it took right off for about 5 miles then it bogged down again,i switched fuel tanks and it took right back off.This went on for about 50 miles till i got back home and i cant figure out whats wrong, i replaced the little sandstone filter in the carb and thats the only filter there is PLEASE HELP!!!!!!
Then you probably have the electric pumps in the tanks, with the oil pressure switch, relays, etc. I am assuming your van is just like the trucks. There are a lot of threads in here on it, it gives everyone problems eventually. You will need to decide if you are always getting voltage to the fuel pumps or not, and check the relay and it's socket to make sure it's good, and also the oil pressure switch.