As the title says, I have a old crew cab 3500 SRW Chevy with over 400,000 miles on it. It will randomly out of nowhere just shut off going down the highway..shift into neutral and recrank it no problem. One really rainy day I drove through a big puddle and it wet the distributor cap and shut off til it dried, so i replaced coil, Dist. cap, plugs, wires, etc.. Several years ago the ignition cylinder stopped working and couldn't shut the truck off, so that's replaced as well..Any ideas on where to start in trying to fix this? New distributor was suggested, and I know on older fords there's a block further down the column from the actual ignition cylinder that can go bad, does that exist as well on a 92 chevy?