Sounds like the window motor is going out on you but I had a similar problem and it turned out to be water getting in the master window switch and corroding the passanger window contact on the master switch. I figured this out because the window would act up when I tried to raise it on the d/s but would be normal on the p/s switch. If both sides act up you can narrow it down to the window motor or maybe the regulator is getting jamed. Best thing to do is test both switches to see if both sides have the problem. If they do remove the door panel and make sure the regulator isn't binding. If it isn't then add direct battery voltage and ground to the window motor to see if it acts up. Just switch the power and ground around to make it go up and down. If it does act up it's safe to say the motor is on it's way out and have it changed.
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