Yellow623 hesitating at last ride

[BlueRooster]

If you guys remember on our last run to Frenchtown the car was hesitating a bit and generally not running right. I found the problem let me know what you think.

My coil is a ford motorsports. Not MSD, nothing fancy(I dont think).
The posts are not screw type though. They are round, clip on. I have never seem them before. The wires on the coil have always been pretty loose and I am guessing that the engine vibration was creating very small gaps which would create an arc that would produce heat....this escalated until the heat became too much and started to melt the clip(Im guessing the wrong clip) When I got back from our ride, The clip was all burnt up, hanging by a thread. I replaced this clip with new(wrong one) and the symtoms disappeared. My question is, what is the right clip? Do you think this bad connection on the coil could have damaged anything else?

AND lately, my tach after the car got hot would start to bobble and cut on and off. Do you think that a loose coil connection would produce that behavior, but still allow the car to run?

I appreciate you guys looking at this.