My 98 dak for the past two weeks will not start on damp or rainy days. I thought is might have been moisture under the cap, but it wasn't. The cap and rotor needed to be changes so that is brand new. I thought it might have been the coil and that checked out. Once everything dries out the truck fires right up. This morning the truck did start with it raining but starting running rough and died when I got out of my drive way and would not restart. I was able to get the truck started tonight with is wet out but it took a lot of cranking. This was while I had my scan tool on live data to see if I could see anything. I really stumped as to what it could be. Any in put would be great.