Cm870 throttle issue

[Hambone]

Its an 07 international 9900i. Ive already replaced clutch pedal switch and had a new 13 speed transmission,clutch,throw our bearing,tailshaft etc installed 15000 miles ago. Yes it is the red box on drivers side but also replaced the actuator on the turbo, the actuator moves and the turbo freely travels.Idled the truck up again and when it kicks out registers 15mph real quick. The speed sensor is new but that doesn't mean much.I don't idle the truck having an apu but still want to figure it out.. I don't like not knowing. Appreciate the knowledge and help.also the code would come up active for a short time then go passive,but it has come up before any work was done.