Q: Cannot drive past 20 mph Chevy silverado

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Just tonight my truck started acting up, it fish tails and swerves when I try to drive past 20mph and the brakes started to stutter and fail to work. It would come and go. The slippery dash symbol would come on when it goes 20mph and a trailer with 2 wheels comes on (yellow) it would run fine for a bit but start to act up again. Also here and there the lights would flicker and dim.

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