Hot ballast resistor & ICM
Here are what I consider the "big list" of possibilities in no particular order:
1.....Wrong coil/ resistor combination, or a partially shorted coil, or as mentioned, wrong resistor value.
2......so far as hot / melting ECU, Chineseoationized, or other causes listed here
3.......High battery charging voltage. If the running battery voltage is much above 15 (should be 13.8--14.2 with battery/ engine / VR warmed up and "normalized"
4......Something mis-wired causing load on coil+ that should not be there
5.....Do not leave key in "run" with engine stopped. The Mopar ignition is one system that causes coil current to flow with engine stopped.