drummerbart

ok so heres my situation, i have a 98 si coupe power everything. so when i try to do up my window it stops about a half an inch from closing fully and if i try to do it up all the way it starts hopping (since its automatic) and it wont lose properly. so if any of you have any info it would help alot. im thinking its off the track or something the motor is fine or it wouldnt go up or down at all.