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  1. Chevy Silverado Forum (GMC Sierra)
    Code PO138/2271 ...so far I've put in new air filter, cleaned MAP sensor, as well as, 2 new sensors; I figured the first one was bad as well. My scan tool states that it is stuck rich and High voltage. Please help
  2. Chevy Silverado Forum (GMC Sierra)
    I cleaned the MAF sensor, but the engine light came back on after a few miles. I was wondering what to look for next....TPS?.....injector?
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