SandmanPlayz

@Charlie686 My bad man, didn't know what you were referring to lol. I noticed that when I load up and play it all works fine for about 30 minutes to an hour then that's when it starts happening and its only every so often. Was there anything in the rage file that was concerning?

In OPEN IV Go to mods \ update \ update.rpf \ common \ data \ levels \ gta5
And right click on the 'vehicles.meta' choose 'edit' from the drop down menu.
Click on the 'Search' tab and put in the vehicle you want to edit, so 'fbi2'
The 3rd line down will look like this <handlingId>FBI2</handlingId>
Copy and paste this line in its place, or just change the FBI2 to CAVCADE, so, <handlingId>CAVCADE</handlingId>
That will stop the worst of roll overs.
To change the engine sound look 9 lines further down for audionamehash
Copy and paste this line in <audioNameHash>BJXL</audioNameHash>
Hit SAVE in the bottom right corner. Job done

@Officer Wade thank you very much.