IAC Valve - Idle Air Control Valve.
You can look around for it here in the forums - plenty of instructions and descriptions of it....
However, re-thinking this, I will have to agree with Ed. Plug wires are pretty damn tricky especially in the rain and if they're on their way south.
quick test - start the car - hopefully this is one of those times that is stays running.
Open teh hood and have some water with you.
Spill a little bit of water around the boots of the wires and around the coil pack (near the passenger side of the vehicle..back of the engine bay). if the car sputters or stalls, you have your problem.
Replace the plugs and wires...if the problem persists, replace the coil pack
