I have a 1998 Honda Accord V6. The car will shut down while driving, there is absolutely no warning, it just shuts down. I noticed today that when it shuts down the key light flashed 3 times. No other dash lights. When it shuts down there is no rpm or speed indicating. I have replaced the ICM 3 times and the Ignition switch once. I have also used a different key as spmeone suggested it may be the key sensor in the key.
After 20 minutes car will restart and away we go. Sometimes for 15 minutes, sometimes a couple days. HELP PLEASE!

When you replaced the ICM, did you apply a thin, even coat of silicone heat transfer grease to the back of it? If you didn't, the ICM won't last long. Have you replaced the coil?