i have a 96 cummins 12v that just got 100k miles. as i was driving in 4th gear the throttle got really stiff then the rpms went down and then died. when i lost rpms i took it out of gear and still died. later that day i was in 3rd gear driving and just died. dose anypone no my problem?

 

might be the relay for the fss (fuel shut-off solenoid) might be the blue fuse-able link, might be the fss itself. there could be other problems but I would start here.

 

Yes, I would look at the fuel shutoff solenoid. It may be in the up or run position allowing the truck to start and run but drop due to a weak solenoid or hitting a bump etc. You can wire it in the up position to verify this.

Diesel Hard Start Diagnosis

 

thanks illl try that and let you know if it works or not

 

does it start right back up?