Looking for a little help please ................. my 2000 ML320 is stalling sometimes , there was a couple of times with in the last year that the car didn't start , after 5 to 20 minutes it started , I always thought that I was hitting the gas pedal and flooding it , this happened about 6 to 8 times in the last 6 months , ....... within the last couple of weeks the water pump went , I took it to the local shop and they installed a new water pump for me , a few days later I started having the starting problem (( It would just turn and turn like it wanted to start but didn't )), one day I was in the middle of the road and it just stalled , I tried starting it and nothing , I thought maybe my car was low on gas , but it read 70 miles left , after about 20 minutes ,someone helped me with some gas , I went and filled the gas tank up and started to go home , once again it stalled on me , I waited about 20 minutes and it started back up and I made it home , the car sat for a few days in my driveway , and yesterday I tried taking it for a drive , it started right up , I got on the highway , got off the exit , came to a red light , stopped at the light, and the car stalled on me , I tried starting it about 5 times in 20 minutes and it didn't start , after another 5 minutes it finally started , I drove it all the way home without ever letting up on the gas , even when I had to stop I put it in netual , and I made it home , .................does anyone have any idea's ???? I did notice that on the speedometer , it had a wrench with a -300 in it , ((sometimes it appeared there )), does that mean something ???? is it a code of somekind ?? , did the guy who put the water pump in do something wrong ?? could it be a clogged fuel line ??, should I try some of that fuel injecter cleaners when filling the tank ?? could it be the fuel pump ??

Thank you for all who reply