Had a ride on the big Yellow Taxi yesterday as broke down on the Peage. Got a 1977 2lit T4 with Progressive Carb. Was running fine then judderd, happened a couple of times then conked out. Pulled over checked for lose wires etc. all ok. Started after a couple of tries, happened again twice more then conked out on a nasty narrow bit of mountain motorway & didn't restart so gave up and called for help before I killed the family! Annoyingly restarted 1st try to drive onto the tow truck, 1 odd think was some liquid/water came out from underneath when the van was at a steep angle going onto the taxi. AA now has Cyril till Monday when the garage reopens. Any ideas; I was thinking a blocked fuel line or dirty fuel?