"Try removing your Automobilista folder in My Docs, then re-run AMS Config & create a fresh player profile" it work ! many thx !
it work's finaly !!! it was steam overlay , must turn it off Game crashes when i exit garage monitor and other issues :: Automobilista Bug Reporting
Steam overlay causes my game to crash once in a while too. Not a lot but once in a while as soon as I open the overlay, game crash...same with alt-tabbing but it's not too common for me.