When I turn my wipers on for some reason they are not alligned right or something because sometimes they will smack the bottom part of my windshield and other times they will go all they way off the windshield. The whole time they are doing this they make a gawd awful noise.

I have made sure all bolts are tightened but could this be something to do with my motor?

 

Pretty common problem. Just remove bolt from wiper and move it a little.

 

thats the thing i have done this several times and they go back to jacking up but i have bigger problems now so thanks for the tip.

 

The spline they fit on could be worn, allowing them to slip even though you tighten them down.