That's a common problem, the plastic gears are worn. The motor is fine but the gears are plastic and integrated into the housing. You can disconnect the armature and spin the gear inside 180* and reattach. This will use a different part of the gear/teeth in better shape. You can also buy metal gears available somewhere, search cz28.com or ls1tech.com or other. Or you can replace the whole assembly. Hope that helps.
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68 Firebird, trying a q-jet now. 434/10.5:1/997's/240-242 HFT/4L80E/2800 Yank/3.42's/ Vintage Air/ 13.0 @105 mph
70 Lemans, 350/350, A/C, mostly stock
14 Ram CC, 5.7 Hemi, 8-speed, 3.92 lsd
97 Trans Am, HPP Aug 2012 http://www.highperformancepontiac.co...tiac_trans_am/ ***Sold***
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