had that happen to my Z3 many times... if you go to the dealers, they may blame it on bad gas that you put in your car... don't fall for it... the reason is that there is something faulty with the gas meter or something and they did not have a fix for it at that time(in January 2000) They said they are working on a permanent fix and should be ready around April or May... So go to the dealers and tell them your problem... Maybe the permanent fix is in GOOD LUCK!!