2006 Colorado 2.8 code P0171. Changed the upstream O2 - MAF and put in new plugs also cleaned the throttle body. No vacumm leaks that can be found. The VVT solenoid moves with voltage- timing and other PID's move with throttle according to Scantool data file. Any ideas?
Friday, December 3rd, 2010 AT 2:41 PM