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  1. M

    O2 sensors

    Replacing O2 sensors, I know there is an upstream and downstream but can't find downstream on Oriley or rock auto. Do I use upstream for both?
  2. M

    loss of power in 4th and 5th gear.

    I have a 95 Rio grande, 145,000 miles just purchased. Twice when driving, acted like it dies when accelerating 4th and 5th. Does have bad 02 sensors, could that cause it to run bad? It is a 4 cylinder.
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