the vehicle will start then die.ive checked fuel pressure ok spark ok.when it dies there fuel in the window on the carb. check the cold start valve on the front of carb seems to be working can hear it click. the vehicle was running fine before this . has new carb,new distributor.my said it started running rough and then died will restart and die if u feather the gas u can keep it running. if i add fuel it will stay running. any ideas thanks.