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If the wipers are vibrating/jumping on the windshield and new blades and cleaning the glass does not help, check the following:
1-Enough tension from the spring to hold them down on the glass.
2-Make sure the arm is not bent, causing the blade to be angled from top or bottom.
If these are okay, the pivot point on the arm is worn, causing the new blade to fit too loosely, enabling it to jump and chatter on the glass. My 97 Caddy had this problem and the dealer could not (or wanted to) figure it out. Too bad I figured it out AFTER the warranty expired...
Keep in mind junkyard arms ~may~ be worn also...
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-Rob Young 
1972 Cutlass Supreme Convertible (442 clone) -"Lady" (My mistress...)
http://www.flickr.com/photos/robsalbum/sets/
1986 Cutlass Supreme Coupe - "Pristine"
1978 Ford (Old Faithful) a.k.a. "the Tramp"
1997 Cadillac STS (for sale - too many cars!)
1999 Harley Davidson Sportster - "the Freedom Machine"
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