I have an intermittent problem and one that is all the time. The intermittent problem is that sometimes my car will just die at speed and you will have to turn of the car and then re-start it. sometimes it will start right back up and other times you have to let it sit for about 5 minutes. This problem has gone on for a couple years now, but is so sporadic that it is hard to fix.

My other problem is that my car is running like it is missing a cylinder. I have replaced all the plug wires and installed a new distributor rotor. I took it into the Benz repair shop I go to and they wouldn't really look at it because I needed a bunch of tune-up types stuff like the rotor, so I replaced those myself to save the coin, but I would like to try everything I can before I pay the labor involved. Any ideas would be helpful.

I don't know if this is related or not, but yesterday I filled up my car, full tank, not overflowing. I drove about 27 miles so I know I used a minimum of one gallon of gas. After an hour of being parked I came to my car and could smell a little gas. I opened the fuel door and saw a littl moisture. I opened my gas cap and the gas spewed out in volume. I quickly put the cap on. Is this normal that the gas tank can get this pressured to where gas comes out in force? what causes this?

thanks for any ideas