i have an 87 iroc with the 305 tpi. a couple of weeks ago it started loosing spark intermittenly, usually on my way home from work. Before that i had put a new coil and icm on it. One night it happened, in my attempt to restart it my starter blew up into two pieces! I replaced the starter and it started fine so i left it running till it died again so i could find out why it was loosing spark. It eventually died and i discovered that the pickup coil was in bad shape. put a new MSD distributer on with an MSD coil. No spark. when i leave the key in the on position it will overheat my coil. I've replaced the ground strap and negative battery cables. The only spark i get is when i turn the key from the on position to the off position. The ignition switch seems to be working fine. Please give me some ideas as i have now come to a dead end. I suspect the pcm but am wondering if it's something more simple. Please help

 

it runs!!!!!!!!! FINALLY! it was the BRAND NEW icm that came with the BRAND NEW distributer. S.O.B. Thanx to everyone that offered suggestions and tried to help.