I have have a 99 cummins in the shop with the TCC erratic lockup problem I have seen many times, but this is a new one. Most of the other TCC issues I have had in the past have ussually been TPS failure, or leaky alternator diodes. This one has the fuel metering solinoid pattern leaking into the 5v ref. signal on the cummins ECM. Since the TPS uses the 5v ref, the TPS signal is screwed up and unlocking the TCC. I'm afraid it will need a new Injector pump to fix the problem, but thought I'd see if any of you guys had run into this before first. The pump on the truck is a factory Bosch reman that's a couple of years old. Any help would be great, thx.