1999 Saab 9-5 Stalling after get HoT

Ok about 2 months ago my saab starting stalling when I turned it on, and after it got warm it was fine. I never fixed the problem because i was told it was the throttle body and I was waiting to get one used. The problem didnt bother me that much. But now it will start fine but after 10 min. or so i will die (when it warms up) And if you try starting it again it will just crank and crank. It will start again after you let it sit for 20 min. or so. But not when its still hot. So I know I need a throttle body but what else is causing this problem? It sounds like somthing Electrical/Ignition. THANKS