I am having an odd intermittent starting problem with my Elantra. The car is a 2000 sedan with automatic transmission and has 50,000 miles. The car runs great but without warning will simply fail to start. It will crank over fine but will not start. After a period of time, sometimes a half hour and sometimes several hours, the problem disappears and the car will start fine. The dealer has not been able to recreate the problem and the car is not reporting any error codes. They kept the car for three weeks and started it every day (several times) without any problem. I had it back for three days before it happened again. I noticed this time that it happened after the car was driven for about 20 minutes and then parked for about 4 hours. Then it would crank but not start. It started fine 2 hours later. After thinking about it, I believe this is typical…the car is driven for at least 20 minutes and then sits for at least 4 hours when the problem shows up. The only other problem I had was a couple of thousand miles ago the car started stalling and hesitating. The dealer replace the mass air flow sensor and the car has run fine since. Has anyone had a similar problem? Any help would be appriciated. Mike