Upon startup, most of my map will load like the City portion of the map but the desert area and Fort Zancudo and some parts of the Main City will not load. Please Help

So after I reinstalled GTA 5 after because I had issues with mods, I have had an issue where PEDS and COPS just ignore me like an example of this is if I go into a crowd of people and shoot someone they die but everyone around them acts like normal, if I get the Cops they spawn and are just frozen they will get out of there car and shoot me but they can't drive. Please Help me as this is extremely annoying and I would like for my game to go back to normal. I WOULD LIKE TO FIND ANOTHER WAY TO FIX THIS WITHOUT UNINSTALLING

audi q3
Ford F-150 King ranch
1970 Dodge Charger
Local Motors Rally Fighter
2017 Ford F-250 and F-450
2018 Ford F-150
Jeep Grand Wagoneer 1991
Defender 90

Edit by @Reyser: @hcross254 I've moved this topic to Requests section. It'll fit better here.