I have been running the latest crom (at least the latest as of about one month ago) on my Silverado 2500HD 6.0, using the 93 Octane tune. As usual I did a data log and adjusted the injector slopes + 5.0%. No problems for a few weeks, then last week the check engine light came on. I plugged in the Predator and am getting a "P0121 throttle/pedal position sensor A circuit" code. The engine is running fine. Not that this has anything to do with it, but I was driving in pretty muddy conditions last week towing a trailer doing response work for the Upstate NY flooding.
Anyone know what the issue is? I thought about returning the engine to stock and see if it goes away, but haven't done this yet.
Thanks
Steve
