every once in a while my truck will have issues starting, 1st it will turn over/ run rough for a second and turn off, then it will just turn over and not start, finally a 3rd time it will usually start and run fine...it happended maybe once every 2 months but the same problem is starting to occur more often (twice in the last 2 weeks)??? I had new plugs installed about 4 months ago and this has issue has happened for about the last year. All other times the truck runs great, im confused??