[Larry Spillman]

Sounds like a vaccum lock in fuel system which means that fuel will flow to pump until tank runs out of air due to no tank vent in fuel tank fuel will then stop flowing and shut off motor. also you need to check ignition that ignition moduel isnt over heating and shutting off spark to plugs.loosen fuel cap or leave it open and drive car if it dosent stall then you have found problem no fuel no go.
Good Luck Larry Spillman A Happy Cobra owner/