ok here it goes about 1 month ago truck wouldn't start when it got cold (-10c). took it to the dealer and they changed all injectors and injection pump and steamed the tank because they said there was black crud around the injectors. i did have a power puck installed before but haven't put it back on since they changed the injectors and pump. now the truck ran fine for about 2 weeks and now this weeked i went to start it and the first crank nothing i tried it again and it started, it ran for 1/2 hour shut it off and it sat for about 4 hours outside and started fine , i put it in the garage and it sat all day sunday and went to start it this morning and nothing it cranks over good but wont fire so i pluged it in for 3 hours and still wont start. so what do you guys think