washer will not spin everytime

My whirlpool gold washer will not spin everytime. About 90% of the time when it goes into the spin cycle it will not spin, but sometimes it does spin. I would appreciate it if you could tell me what is wrong with it.

The educated guess is that it is a clutch problem, this part here

AP3094537

It will take some time to replace it, but it is not a difficult repair. This site

http://repair2000.com/wp_clutch.htm

will take you through the process