when it get hot, it wont crank back

I got a 84 b2000 sundowner and when i go for a trip around ten minutes. then let it sat for five and attempt to crank it back it up, there is no fire from the iginition coil. I took the distributor cap off the other day and there was oil in the distributor since then i have rebuild the distributor. it has a new iginition coil, what is my problem?