Duster Ignition problems when hot

If I wait 10-15minutes it`ll fire up like a charm. Also when the problem is on, it starts when I release the key. So its like the MSD dies while the key is in start position and when I release the key it gets a spark and boom, its running. What if the starter gets in short when its hot and sucks all the power?? Should I try with a new one...
If it lights off when you release the key that means your problem is in the 12v switched ignition feed to the MSD box. You have 2 wires on the the ignition switch circuit going thru the firewall that provide 12v to the small red wire (switched ignition input) to the MSD box. When you are cranking the brown wire has 12v, when you release the key to run the blue wire has 12v. Start at the MSD switch ignition wire and work your way back to the ignition switch. Don't forget to check the firewall connector.