gta2 multiplayer wasn't a mod, so mta needs more coding then R* and don't forget that the mta team aren't game-makers but justsome verry good and verry smart modders
uninstall the custom cars, next time use the search button or read other post and the faq, devs said MCUH times that you need a CLEAN game for mta!
sorry for the huge font
well, i first had a router (text on the box) it shared the internet and we could use it for network-only then we bought a hub (router was broken again it said hub on the box) and it did the same, so i think it's the same