There's time my truck starts up, then there times it takes turning it over15time

Hi Rogjr, There are many possibilities here, the Dakota needs to be inspected by a technician who can attach test equipment so when it does not start he/she can tell if it is fuel or ignition, once that is determined it can be diagnosed and repaired Dan CarSmart Auto Service

If I was to GUESS , I would go with a crank sensor , before cam sensor , but that's just my guess. Your guess would be to first determine , if when it won't start , if it's missing fuel or spark and then , depending on the cost of parts vs. diagnostic fees , which is more practical for your circumstances. An intermittent problem , that is hard to duplicate for a shop ............hard call , but I'll stick with my first guess. Good luck!