i got this truck used I've had it about 1 week I've messed with it got it started once and it ran for about 35 40 seconds it died out and havent been able it get it started i set everything by the book and still unable to get it running the frist problem i had was the coolent head wasn't tight got it tight and waited 1 hour ans it started right up like i said it ran for about 35 40 seconds no luck since can anyone help me?