I had the same problems..got it fixed today my fuel lines running to the carbs were clogged with little rust bits..nasty plus i knew it was a fuel related when i disconnected fuel lines and were bone dry with 1/2 a tank of gas. Solution..cleaned out all fuel lines with air nozzel with air compressor, changed dirty fuel filter, replaced old corroded fuel pump. ..result..car starts up nice and smooth, doesnt shut off while idle.......try it...