help need a good gasser tech

[superdood]

Just a shot in the dark.One of my superdutys is a v 10 gasserand it had an intermittent starting problem now it just wont start.It is getting fuel but i dont think its getting spark.I checked power at the relay that I think powers the cops no power at that while cranking,ran a kill switch and it fired right up that was three days ago.I went out this morning to drive it to a lot to put it for sale and it will not start.Can anybody point me in the right direction?