I just went through the car database. If none of your cars had a fuel value then I deleted you and your cars from the car database. What that means is that if you haven't played on the server for quite some time your cars are probably gone. But if you've played the last couple of weeks you're probably okay.

Me doing this reduced the car database by half, so that should reduce car menu lag and decrease the chances for it to bug. Also yesterday I put in an anti-crash protection for the cars when you're using gravity gun so that should help keep the server up too.