having trouble starting some times. it will crank and crank but not start. some times it will start up quick and some times it will just turn over. fuel pressure is 26psi at the VP 44. it did this when i first got the truck 2 months ago and it was stock. stock lft pump look new and it is working. also have pusher and it's working. no codes. no white smoke. it will also brup when idling some times. other then that it run great! any help would great.