I have a 99 24v Cummins that recently started having problems where the tac would drop out while driving or idling and the truck would miss fire and stall out. I replaced the vp-44 the cam position sensor and lift pump. Once that was done the truck ran good for about a week and then started having problems starting. Now sometimes it starts right up other times it won’t start at all (cranks but won’t start). Not sure if something’s telling the truck not to start or what.