My game loads fine but after it says "load successful" it goes to a blackscreen and crashes. Im pretty sure its caused by a car I downloaded because it was working fine before.

If anyone knows how to fix this please let me know! Thanks.

Remove the car.

Sorry to sound stupid, but how would I do that?

Remove the car.

This.

Does it start working after you remove the car? 

How would I remove the car?

If you didn't make any backups, you'll have to reinstall your game, however if you did, you need to take whatever car you replaced. Let's say you replaced "police", which is the vapid "Police Cruiser" in game, and you'll need to install the original police.wft and police.wtd just like you'd install a normal car mod.

How would I remove the car?

 

If you created a backup of your vehicles.ide before installing it, simply extract the wtd. and wft. for the original car, and import them into the modded slots. 

Alright thanks.