No, the coil is fine...... what's happening is the charge is taking the least resistive path to ground - in this case, the frame around the coil. Every Mitsubishi coil I've seen does it. One way to make sure your wires are installed with good connections is to raise the hood with the engine running when it's dark - and watch the coil - if it arcs, you have a bad wire connection somewhere.

Frank

'89 [color:"white"]G-Raider[color:"white"] [color:"black"]Supercharged 3.0L, MegaSquirt 2, lockup A/T, 2.5" exhaust, 172k, Cibie H4s/Oscar SCs, Hella Micro DE fogs, Cobra CB, Superwinch hubs, LSD rear/Aussie Locker front, Bilsteins, Lifeline AGM, Rust-Oleum