My TST is acting up for the third time now. I have sent it for reprogramming twice, and each time i get it back a new problem arises with the same old codes. My new problem is this, after driving for about 15min the PMCR shuts down 1 and 2 injector, so the truck runs like crap. The farther you drive it the worse it gets. In fact you can unplug the injector harness at the 1,2 injector plug and there is no difference in the way the truck runs. What do i do? the CEL light is on with the same old codes again, po336,p0341 and p2138. I love this box when it works, but i have so much trouble with it i want to burn it. Any idea's...