@chonkie thanks for your helping but still doesnt work for me.
I tried several gameconfigs only this works https://www.gta5-mods.com/misc/gta-5-gameconfig-300-cars
but more than 16 add on cars will crash

@Reacon but there is only one gameconfig of version 1737 on this website.
So could I use another gameconfig which is not 1737?
Sorry I am not a expert of this part.
Thanks for helping me.

thanks for your replying.
I am using the newest gameconfig of 1737 still stop loading.
I tried many add ons eventually stop loading again unless I remove the last installed add ons

Hello everyone,I have already put 16 add-on cars in my game and works, but when I want to add more cars or add-on maps,the game stop at the loading screen unless I remove the last add on I added.

I installed 1.https://www.gta5-mods.com/tools/heap-limit-adjuster-600-mb-of-heap
2.https://www.gta5-mods.com/tools/packfile-limit-adjuster
3.https://www.gta5-mods.com/misc/gta-5-gameconfig-300-cars

Does anybody know how to solve this problem?
Thanks.