So i started having a rough running issue that wemt to the truck dieing while driving intermittently i replaced the board in the ficm with no change. I went for broke and replaced the ipr last night. Had a rough time starting it this morning once it was started idled really rough waited 3-5 minutes to warm up high idle kicked in I hit the break pedal to shift and it went back to a rough idle shifted into reverse and got a really low idle tried to apply power with accelerator and none was found I restarted again later unplugged the icp it had enough power to get up the drive but still very sluggish. Plugged it in no power. Rinse and repeat but this time had sluggish power with it plugged in and unplugged.... what gives. I'm running short on time $$ and patience. Any ideas

 

How are you determining these parts are bad

It's very expensive and frustrating to throw parts

 

Do you have digital gauges

Any codes

 

I did the voltage test on the ficm had 19.5 volts koeoff. Replaced the ficm board. Had a slightly less rough run for 1 day then it died. I swung for the fence and replaced ipr there was a chip in the plasting ring holding on the screen about 1/2 long. I'm losses man I'm wondering maybe a cat converter clog. It has get delete btw. Also I am getting a few codes o e for #1 glow plug and one for #6 INJECTOR.