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  1. 9

    99 Yukon intermittent loss of power usually on freeway or grade

    Thanks for the suggestion. It works on a bench test (backprobing for smooth voltage increase while gradually opening throttle with the key on). Have you had issues with them when they passed that test? I'm asking because I think something is failing intermittently, and wondering if TPS can...
  2. 9

    99 Yukon intermittent loss of power usually on freeway or grade

    Thanks for the response. The fuel filter was replaced twice since it began having the problem, so I'm inclined to rule that out. It has since been to another mechanic who wanted to replace the MAF sensor, but I decided to disconnect it the next time the problem occurs and see if that changes...
  3. 9

    99 Yukon intermittent loss of power usually on freeway or grade

    I guess that's possible, but the thing that's really confusing to me is that it will be fine every time after just shutting it off and starting it again. It seems to me that a bad ground or short wouldn't stop causing the problem until the wire moved back where it belonged.
  4. 9

    99 Yukon intermittent loss of power usually on freeway or grade

    I'm actually trying to solve a problem on my mother's 2002 Express van, but it has the same drivetrain as my 99 Yukon, so I thought I would post here. It will occasionally lose power (when more than 1/4 throttle), starts coughing and just won't go. If I pull over and turn it off and then start...

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