My 96 e300 wouldn't start in an unusally cold (30's) weather here in Orlando. It starts and idles roughly for about 30 seconds and then dies. I tried starting it several times with the same results. The glow plugs are good (replaced all of them a few months ago). It seems to be a fuel delivery problem as it wouldn't start up all the way through, but I wouldn't know where to start diagnosing the problem. Any suggestions from our members?