Electrical Demon?

Have I mentioned I hate electrical problems? I tried a jumper from the Battery+ terminal to the coil+ terminal. Started right up and stalled after 4 or 5 minutes. So I took off the jumper and checked the voltage at the coil. I am getting 11.6v on the coil+ terminal with the key in "run" position. Also 11.6 on coil- terminal. Indicating bad ECU? (ECU ground is good) but shouldn't it have run well with the jumper if that was the case?