Lots of places are selling super cheap and super THIN 8-1/2x11 printing paper! Make sure your using QUALITY paper.
If you print a page of text flip it over and see if you can see it from the back side, if so it's cheap thin paper that will NEVER print properly.
Also, get a cotton swap dipped in rubbing alcohol and clean the pickup rollers. They will develope a slick coating over time that will not grip the paper.