[Chevyholic]

Take out your ignition control module and run down to O'reilly's, or the equivalent and they can test it. Also, O'reilly's usually only stocks the Accel control module, which is like 40-50 bucks, so you may want to order one because the stock replacement is like $15, or so. Just depends on how fast you need your truck.

I just ordered the new distributor from Skip White's Ebay store and for $50.00 shipped, it's a pretty darn nice dist.

Also, depending on your engine setup, you may want to look at a cab/cowl seal. I just went through what happened to you and after opening my dist cap, I could tell that during rainy days that water was coming off my cowl and getting into my distributor, severely shortening the life of it.