For Grand Theft Auto IV on the PlayStation 3, a GameFAQs Q&A question titled "can PS3 GTA4 play with PC GTA4 online?".

Modded vehicles in GTA IV are any vehicles that have multiple modifications setting them apart from their production standard. Every modded vehicle is driven by a specific gang. Modded vehicles in the game don't have any performance advantages over their production standards either. But now let's start, step by step: .2. SAVING METHOD FOR YOUR CHARACTER. 1) While on foot, choose a place where you'dd like to save your game and to find yourself at the same point when reloading. The place can be an interior or an exterior, it doesn't matter. 2) Now don't move and open the Trainer main menu.
Click "Connect" to connect your PC to your PS3. Locate the GTA IV folder on your PS3's hard drive. The file path may differ depending on your system, but it is commonly located at "hddo\GAMES\GTA4." Open the GTA IV folder. Locate the "USRDIR" folder within your "GTA4" folder. Find your downloaded GTA IV mod files.
Well. my GTA IV was a bit hanging on me but it never froze the entire game. All I did was turn off my PS3 screensaver, deleted my internet cookies & cache files, and port forwarded GTA IV & the PSN. As far as the game data and savegame goes, I rather wait for a installable patch.
9- one last step . to make the game look fully support ps3 controller you can change the buttons hud . here is how to do it here . thx to "chngdman" thats it ! . 225 36 174 135 75 132 81 369 4

how to play gta 4 on ps3