Ok so i am having a problem with my 91 audi 80, It runs great when she wants to but if i drive her for more then 30 min she will stall out and not start back up for at least an hour , i have troubleshooted it to be a fuel distribution problem ( I disconnected the fuel line from the intake by the Carb. and nothing comes out) , but like i said it only does this when it is warm so i am really stumped, can some one please help me .