I have a 78 F-150 with a 351m with a motorcraft 2150 carb. The problem im having is the truck starts but almost immediately stalls. I had the carb rebuilt, i replaced the fuel pump, all fuel hose, fuel filter, choke pull off and some new vacuum hoses. I disconnected the vacuum hose to the choke pull off and started it, then the truck runs fine. As the truck is idling i reconnect the vacuum to the pull off and the truck stalls??? is it the choke itself or another problem I havn't tried yet? Any advice would be much appreciated. Thank you!