Have you checked the wiring plug on the motor? The contacts go green and fuzzy if the get damp and they aren’t well shielded again water. If not it might be the contacts inside the motor, they have little springy arms that rub on a copper disc and when they get dirty the motor can do all kinds of weird things like run slowly or not stop at all.
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PF late '97 D2 2.8 Aluminium Silver. Solar roof, Full Heated Leather, Double Glazing, 17" wheels, Sports Steering Wheel, Cruise, Blinds, Bose sound.
Fiat Tipo diseasel econobox with all the buttons and none of the soul that now does all the heavy lifting.
Ford Capri Laser: noisy, slow, thirsty, bouncy, no buttons but it always sounds like it’s REALLY trying and I can’t help but chuckle when it parps and boings along. And people of a certain age stare at it with a wistful look in their eyes that clearly says…I had one of them. And I sold it because of the kids 
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