Hello all. I have a 2000 Ram Van 2500 with the 5.9L engine. My problem is it will not start after or during a rain. It cranks fine and I can hear the pump working. I have spark and fuel, but the motor will not fire up. It sometimes acts like it is dieseling ( trying to fire but stumbling at a low rumble ) then it dies. Any ideas on this one? I will be replacing the dist. cap and rotor along with wires. Could one of these be the culprit? Thanks in advance. Shane