So all of a sudden ever since I got into GTA 4 again my vehicles have been messed up, sometimes when i'm driving (seems to be more with modded vehicles) I seem to start flying in the air for a brief second then the car suddenly gets pushed to the ground and starts glitching out and explodes, it looks a bit like this Youtube Video.
It happens alot when doing jumps and when the car lifts of the ground.
Sometimes I also cannot reverse.
It's kind of like the cars are getting stuck on a node or something, it doesn't happen to npc's however.