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Been reading all sorts of posts, yours is what I am experiencing in my 2020 bighorn 5.7 etorque 3:21 rear 5'7 bed. I don't have eco mode, though. Started about 4500 miles and still doing it at 8500, does it at low rpm 1100-1300. Shutter like disruption of power. Happens most noticeable in...
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