Ignition Coil keeps burning up -- 91 Chevy S10 4.3 V6

91 Chevy S10 4.3 V6 – Ignition Coil keeps burning up; I have burnt through 5 coils already. It will run fine after the coil is changed but after 10 min or so it cuts out and won’t start back up until coil is replaced and then problem starts right back. I have changed the ignition module, distributor, plugs and everything I can think of but problem still keeps up…. Please help me with what’s going on, everyone I talk to can’t figure out what the problem is.

What is the voltage on the pink wire at the ignition coil when the engine is at 1500 rpm?