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The first thing that comes to mind, jack up the back end, with the hand brake off, and spin each back wheel. Look for sticking or rubbing brakes, wheel wobble, noise, etc... I've had wheel bearings go bad and sticky parking brakes drag.
Also look over the tires for scallops or cupping that might indicate a bad alignment.
Third- wipe your finger inside the tail pipe. Is it oily? Bad seal/ring or too rich.
These checks should be fairly quick and free.
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