Wet your windshield, turn them on and shut off the ign when the wipers get to the top of the stroke. Get out, take off the wiper arm, and push it back on the post so that the blade is just touching the edge of the windshield (top,side of frame) If they over-run on top and bottom of stroke, it generally means that your quadrant gear, and likely, the cable too, are worn, so that ther is slop in the mesh between the quadrant and cable. It's a couple hour job and some medium dash dissassembly.
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