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Lacking power under load

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I’m new here, a beginning diy mechanic and on vacation at the moment at the in-laws, so I have some resources but not on my own turf. On the drive down here I noticed my rig (2014 Suburban LS with a 5.3L V8) started lacking power going over some large hills on the highway. I had the pedal floored but could only go around 50 mph (speed limit was 65). I bought the SUV a few months ago and haven’t really had any issues with it. Any ideas what my issue may be?

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