Old subject, but while it is revived, I used to have the same problem with the cheap refills that you get from the dealer. I put a bosch wiper in there and have not had the problem since. Also, oil and dirt residue built up on the wiper blade and/or the windshield can cause skipping.

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Ali Al-Chalabi

2001 CLK55
1999 Dodge Ram 2500 Cummins Diesel
2002 Harley-Davidson Fatboy
Merlin Extralight w/ Campy Record