Last Friday while trying to get back home my Silverado LB7 went into limp mode and would only run about 1100 rpms. It thru codes P0201, P0204, P0206, P0207 and P2146? Got it back to work and I could clear the codes but they came back every time I started it. The next morning I cleared the codes and it seams to run just fine but I haven't driven it very far. I have a Edge tuner CTS2. Any help would be appreciated