Thanks! I'll have to give it a go. Appears that most of my custom vehicles all have 4k textures. It's just odd that I can use them all in story mode with no problems but when I force duty it happens especially in the city. It's just frustrating to be having these problems in a couple year old game when I have an I7-8700, GTX 1080, 16gbs of RAM, all on an SSD. Hopefully, this will fix my woes. Fingers crossed.