Sounds like a bad timer motor. It could be the escapement, but they usually hold up pretty well. Depending on your skills using a multimeter, we may be able to narrow down the problem. If not, I can give you a part# for a new timer. They usually pop up quite often on ebay for reasonable prices.
I checked on line and it shows your timer as a 204454, if you have the "Permanent Press" cycle. However, online info has been wrong far too many times to trust it, so I'll peek at my microfiche slides to confirm. If you pop the console cover off (2 screws and it lefts off), there should be a part # on the timer body that will start with a "2"
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