OK I replaced the dual cp3 controller because it was blowing fuses and had a high rail pressure idle. When I replaced the controller it stopped blowing fuses but still has the high rail pressure what causes it fca or bad rail pressure sensor or what.

 

I am thinking bad rail sensor.
If you have anyone near you that has a truck with cp3, ask them to swap out to test
then you will know.

 

a bad rail sensor can cause it to have that rough idle rite or no

 

at idle its rail pressure is at 25k to 26k could it still be a bad rail sensor

 

The only problem I had was with fca.
The truck would stop running, let it set for a minute, would run again.
I changed it, no more problem. If you lived closer I would let you try one
of each and see if that is the problem. That is why i said try and find someone
close to you and swap them out, would take a couple minutes to see if that is
your problem. Have you checked for codes. turn key on and off three times.

 

the guy replaced with 2 new fca's still no change it dropped maybe 1000 psi. im cornered its in abilene tx i cant find anyone thats willing to swap parts to let me test. we do know the rail is leaking from where the pressure relief valve is

 

If the rail is leaking, that is part of your problem.
I have a new rail, and some used sensors here.
I will sell you the rail and sensor for $100 plus shipping.

 

The sensors and rail still good and where you located bc I wanna do next day air if possible

 

sorry sensors they still good