2002 Ram 1500 4.7 p1391

[BRIAN617]

Int loss of cam/crank signal, random coil primary faults. Runs great one minute, then lopes like a top fuel dragster the next. Scoped cam and crank several times, but today used coil driver circuit for trigger and caught this.

Any ideas whats happening here?

[Witsend]

Second picture looks like the primary coil voltage just drops to zero without any firing spike. Maybe the wire that attaches to one of the noise suppressors on each side might could be cracked off and grounding out on something ?