How to find out what crashes the game (Grand Theft Auto 4)

've made a lot of mods and now, about every 30-40 minutes the game crashes or shutdown or simply without error. The Question is: is There any LOG file to find the error? Or maybe some kind of file checker, which shows a corrupted file?

A lot of mods ranging from Weapons, ending with the mod LCPDFR. Almost everything in the game has set the fashion.:)

P. S: I understand the game immediately crashes, but so it after 30 minutes flying, so can't understand why and because of some fashion. It happens by the way just crashes.