Scorpio69

I think I may have fried one of my coil on plugs or the circuit. Here's what happened. I just got this car not too long ago. I had checked the condition of the spark plugs and noticed that the ground wire was not attached, so i attached it. When I started the car my neighbour noticed smoke coming from the area by the COP. Now the car has a misfires code. Does anyone know how the test the coils and/or the ignition circuit? Or if anyone has an diagram would be helpful.