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Joined: Sat Feb 29th, 2020
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I know that PO171 is usually indicative of a vacuum leak but I've eliminated that issue. The MAF and Throttle Position Sensors have both been replaced more than once. The odd thing is that during the winter months I very rarely have a check engine light. It comes back in the warmer weather and the oddest part of the whole thing is that the truck runs great whether I get the check engine light or not.
Any input would be greatly appreciated!!