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As long as you have TC held back, its OK, we know it slides easily on tranny input. Seems like a unconventional diagnostic step though, as cracked flex plate or loose bolts easily seen by visual inspection.

You held back spining torque converter from flex plate while engine was running? Hard for me to picture this, please stay safe.

I would not run it a lot like that, it is possible for TC to slide back and engauge flex plate anyway, not sure what would happen, probably not good though.

Leaking injection pump line(s) would cause a pretty good vibration if leaking enough that the cylinder won't fire. Not sure what you mean by disconnecting torque converter. Did you unbolt it from flex plate?