My friend is having problems with his 2002 dodge ram 1500 5.9L 390. So i have a problem with it sitting in my garage. He told me it was a bad fuel pump. So we replaced the pump. We started it, it ran for a minute and died again. Wont start now. It cranks, we can hear the pump prime and it has pressure. It also has suction so I know its getting air. I haven't checked the spark yet. What can be wrong with this thing. I will get is scanned on monday to see what codes pop up.

Thanks

 

cycle the key on off on off until you leave the key on and a code pops up 'P0987' or whatever. When it's done with the codes it will flash 'done'

 

SO I got the code P1491. Which I don't believe has anything to do with my problem. The truck has air and spark. It feels like its choking out. It will start and run for a minute. Then the RPMs will go crazy and its sputters to death. I replaced the enitre fuel pump assembly. What should I try next?

 

Could be timing. Could be a vacuum leak. You verified spark on each plug?

 

sounds like it could be your IAC or TPS, I would take the throttle body off and give it a real good cleaning

 

I did not verufy each plug. It will start and run for a minute before it chokes out. After it dies I have to wait a couple of hours before it will start again. I assume it has spark all around becuase it is not missing for the minute it does run.

 

Gotcha, any check engine lights on or computer codes recorded?

 

P1491 is the only code that pops up.

 

Do like Dodgeboy79 said. I had similar problem and a good scrubbing of the throttle body fixed it. Along with some Techron and 93 octane.