1995 concorde no start

I am working on a 1995 concorde with a 3.5 v6. The car was running like a champ and then shut off out of the blue. It cranks just fine and is getting fuel. My issue is with spark. I only have two out of six cylinders sparking. My scanner sucks and will not tell me anything about the crank or cam sensors. The car isn't mine so I don't want to just throw parts at it with my fingers crossed. Any help would be greatly appreciated. Thank you in advance.

Is the vehicle showing any codes? When the cranks sensor went out in my brothers it threw a code.

Mine had similar symptoms, and it was the timing belt. It didn't break, but the nubs wore off until there wasn't enough for the crank to grab onto at start. Leaking water pump was saturating the belt without me realizing it. Pull cam sensor from upper timing belt housing and look to see if the sprocket is turning while someone cranks it.