erratic wiper behavior

Experienced Ones

I have a 93 Cherokee base model with automatic trans and 4.0. I do not have intermittent wipers. I have noticed that my wipers have a tendancy to run at variable speeds and also at variable sweep lengths. They always run but seem to have a mind of their own. The variance in speed and sweep length seem to have nothing to do with any other aspect of the vehicles operation: The erratic behavior is just as likely to occur while traveling down the freeway or while stopped at a light. I assume that something is about to fail and was wondering if anybody out there has had a similar experience and a possible remedy?

Thanks for any help.

Wayne

check for electrical connection corosion and lube the pivot points. Both no cost fixes. It sound like the motor is still doing its part.

Thanks for the response

Wayne