Car keeps crashing game after adding a new handling line

Hi, I have dealt with putting police cars in before. But these vehicles never came with a handling.meta and were using the stock gta ones. So i went into the stock gta handling.meta copied them out to create there own handling.meta ive done this in the past except they had a handling.meta before. But once it was all done and the handling id in the vehicle.meta was changed to work with the handling line i made. I decided to try them out to see if the changes i made to the handling.meta worked as i wanted to increase the speed. But everytime i spawn the any of the vehicles in that are the addons i made a handling.meta for it crashes my game. Please help this has me frustrated and I cant seem to find out why this keeps happening.