Whirlpool Washer not spinning on wash/rinse

Have a older Whirlpool that works good other then its not been spinning out the clothes except on the final spin cycle. It agitates fine. It just drains the water on the wash and rinse cycles instead of the spin with drain. If I catch it while the water is draining during these cycles then stop/start it the spin in-gauges and it spins like its suppose to. Any ideas?