Something is touching a cable I think. Check rear of truck left side and see.if anything is touching or wet or just weird. Maybe even under spare tire wire radio stuff is like a bump in road loosens up a wire maybe

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More gas mileage = more square feet to pimp
x5 4.4i
2001 topaz blue
x pipe
rear window shades
20inch chrome 4.8is wheels
angel eyes with color matched housing