Maybe your computer is ovreheating... Opening the side up sticking a fan right up against it and wait 15-20 min. Also some graphic cards have fans on them to keep them cool make sure they are working. Im having the same problems but i know my computer is good enough to handle it but gta wont let it
I would start my own post but the website wont let me... I am have the same problem but my comes from the patches for the game wont install correctly... it says problem with gtaiv_config.exe im going nuts.