My 2001 Dodge Ram SLT 5.9l Gas has been misfiring and giving codes on different cylinders? I have changed just about all the parts you can think of and the simple tune up with plugs wires and cap rotor. I replace the coil and pick up coil all sensors air intake sensors. I had it tested for intake leak and it was not the problem. All cylinders are tested for correct pressure. I even brought it to the Dodge dealer who could not figure it out. Brought it to a guy who has 30 years on Dodge trucks and he told me my Fuel rails are rusty.... Where can I get them? I was also thing the ECM Control Module is bad. Thats the only part I have not changed. Help

 

I have a hard time believing the inside of your fuel rails are rusty enough to be causing misfire issues. But you can probably get a set from a junkyard cheap.

What test was done for intake leak? The factory test is usually only gonna show a leak if there is an extreme leak.

Have you pulled the plugs for the cylinders that are misfiring and see what they look like?

How old are the O2 sensors? Catalytic converter clogged maybe?

 

You can take the fuel rail off, pull the injectors, and clean it up/out. While the injectors are off, make sure the intake screens on those are clean too.