Yes, ISC shorted out causing a blown driver.
Yes, 1G ECUs are the same but have a different eprom chip, but it will run as long as it is for a 5speed. Auto ECUs are programmed for smaller injectors.
If you get a 1G ECU and want to be completely correct, Send the blown ECU and the new 1G ECU to me and I will recap, clean, and socket the new ECU and then pull the chip out of the GVR4 unit and slide it into the new socketed 1G.
And then if you ever want to do a Keydiver chip or DSM Link, your all set.