Well 97 ram 2500 5.9 magnum. Its popping p1391 and p0320. It runs good for the first 5 mins then starts sucking air thru the throttle body. Try to give it gas and it just falls on its face pops and dies. I've changed the crank sensor , pickup coil, GPS, map, all the wiring harnesses. 02 sensors, computers. Iac is new. Fuel pump was new when I put it in the other truck. It acts like it's running out of fuel. If I play with the throttle slowly alittle at a time it will speed up and fall back down after I let off. Any ideas? Cant test fuel pressure rails dont have a test port. Oh one more thing if I hit the bottom of the fuel tank while it's running it acts like it wants to clear up but as soon as I stop hitting it goes right back to screwiij n up.

 

Sounds a lot like a failing fuel pump to me..... What brand pump did you put in?

 

It's a deilfire 250.00 pump but I know they go out just like any other pump. I'm taking it back tomorrow and getting another one.

 

deilfire?? Never heard of them......