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These have an upper and lower intake air temp sensor. I can't seem to find a diagram of their locations, however if one is failing this could happen. Over time they get covered with dirt, dust and other microscopic particles and don't function properly. Basically they send the wrong info to the control unit and it will cause it to do this. I would ask that these be tested as they can fail and not leave any codes. Basically the computer is pleased as long as it sees info. It's not smart enough to know if it's wrong or not.
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I hadn't heard back so I thought I would follow up and see if you needed any further assistance with this?