Car started to stall after filling up took to mechanic who ran system check and nothing showed up. Tried not filling all the way and had no problem. Fuel gauge then stopped working so I took it to Kia in Daytona, Fl. They ran a system check and once again nothing found. Gauge started to work so they said a bug could have gotten in the filter but could not fix stalling problem. Today it just stalled 5 times within a 1 mile trip and tank wasn't completely filled. Why can't anyone find out what's wrong?