230sl wont stay running

hello i just baught a 1966 230sl,it had been sitting for a year after it ran out of gas. i have rebuilt the fuel pump and disassemled,cleaned,fixed the cold start valve.
when the car is cold it starts and runs good,after 10-15 minutes it wil not idle or stay running under 1500-2000 rpm without assistance of the cold start valve.let cool and come back it starts over again.
where do i go next?