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o2 sensors

  1. Do downstream O2 sensors affect performance?

    Chevy Express Forum (GMC Savana)
    Howdy folks, I have a 2013 Express with a 4.3. I recently experienced a couple of episodes of stalling, and then rough running on restart. Both occurred when I put the van in reverse, to back up to a bay door. Had been running fine before then, and when I started back up and drove out in drive...
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