Hello therealclown.
Were the tires pristine? As even "damaged" tires affect the vehicles grip and behaviour of the vehicle.
Regards,
Geez

This happens quite often with Niva and Sedan using pristine tires that are not able to be repaired any further.

It's possible to fix it occasionally by letting your friend drive your car for few meters or by ripping all tires off and then putting back. Neither does work all the time unfortunately.

@Geez I couldn't tell you honestly. Its safe to assume that they weren't all pristine. Ive had trouble with every vehicle though. The hatchback (after finally getting one unstuck) also drives like its on ice. Again I couldn't be sure about tire quality there either. All of the vehicles are stuck upon initial 'fixing up' though. Most cannot be unstuck. Its like the tires are in the ground or something. You can almost always get the bus unstuck by taking the tires off and putting them back on and it drives fine also. Tire quality hasn't mattered for the bus at all... even with a missing or flat tire it still drives fine. I cant confirm the stuck in place issue with the sedan though. I can say for sure that when you are driving a vehicle near another vehicle (moving or not) it causes some serious business lag. Insane lag. The sedan really just seemed to be going where the hills were taking it for the most part. Had a little fight in it but the hills were winning (hatchback too). Hope that helps.