@dannythezuko I have all vehicles sorted by type in sheet, started replacing cars brand after brand. First replace all cars which have their original models (depend on real names of car, finding that model of car on website). After every 4 cars test it, which are bugged, crashing game or not much good looking I leave as opened, which are done I mark green in sheet. After each 10-15 vehicles making new backup.
Then just replacing emergency vehicles as police, ambulance etc took me 2-3 days to figure out right ELS fully working models + make them LA liveries. Same for commercial vehicles In total I spend more than that 6 hours by only listing models on website
But back to the theme - 90% of vehicles have 2x meta + 2x handling. That ones which have tuning have 2xcarcols too to edit. If you didn't changed them, that would be possibly problem of your glitches. So just check it for models which you have bugged and if it's all changed right, then problem is in models and if it's not unlocked to be able edit model in Zmodeler, you can't do nothing about it. Just write feedback to the autor in the comments of the model (: