my bike runs great for 2 miles or 15 minutes in garage then stalls. It has new batter and I replaced the regulator think it was the problem. After it cool for 20 to 30 minutes it starts and runs good again. I wonder if it is the pickup or IC box.

What "EXACTLY" does it do? does it simply cut out or does it slowly get worse and worse, the coils can get tired after a few years and the HT leads get brittle with the heat + the plug caps can get tracking inside of them that will get worse over time. That is just for starters, so a more precise description of your problem would help with a diagnosis.