My 93 240 wagon has had problems with the rain and not starting in the past. We have changed the plugs and the wires a few times and this has always solved the problem, leaving the car running well for months. The past week has been really damp and my 240 has had a few troubled days starting, but has come through. Earlier today I had my oil changed and was planning on changing the plugs and wires, only to find my car completely stall out while driving. After stopping the car I went to restart it, it will turn over, but never start. Having the plugs in my car at the time I replaced them, and the car started up right away. Later this same day I started the car (started right up) drove about 3 miles, and again it stalls out. Any suggestions? any advice would be great

In order of likelihood:

Fuel Pump Relay
Ignition Power Stage
Crank Position Sensor

This is all assuming you have done a fuse service recently and you do not have a problem with "companion" fuses on the battery post (only some '93's even have them). Art B has a nice solution the fuse 6 issue the cars without the battery cable fuses seem to have.