wiper motor ???

having some issuses with my wipers. its ussually worhing fine ,but as of late, they have been chattering or skipping on its up strokes. a few times they would just stop, especailly if i have is set on delay. then id stop the truck and actually give the wipers a small nudge and they work again. does it sound like the motor itself or is there something that may need lubed? ive cleaned my multifunction swith(thinking maybethat was is) but did not solve the problem.
its a 91 s10 blazer, 4.3 tbi.

The Pulse board has a solder crack in it.
Run a search on hear for the problem and fix.
You can put a drop of solder on the crack or just replace it.