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  1. 07.5-10 LMM Duramax Powertrain
    This is my first time on this forum and I need some help. I was pulling a 20ft car trailer with a 36hp tractor up a 6% grade going 65mph and my Duramax said reduced engine power and change fuel filter with a p0087 low frp code. This code keeps popping up everytime I climb this grade. My frp was...