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Could be a few things. Usually a driveshaft or sticking caliper will be effected by throttle/brake use, but not always. If putting the FWD fuse in makes it go away, it's likely driveshaft or rear axle related. If it's a sticking caliper, spending some time at speed and then gently stopping will leave one brake VERY Hot (like, just hold your hand in front of the wheel, you'll feel it. Don't touch the rotor!) Inspect all suspension bushings. Control arms, ball joints, tie rods and ends, steering rack bushings, etc. A combination of a slightly out of balance tire and a couple of old bushings, for example, can turn into a pretty good wobble.