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Heavy electrical load and a badly worn and or loose belt that is slipping! There is a steering position sensor at the base of the steering column that tells the variable assist Power Steering how fast you are turning the steering wheel. When it gets faulty, there will be lurches and surges in the steering. Easy to replace, costs about $60 from GM.

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Q: Electrically what affects power steering on a 97 4wd suburban or can cause intermittent power steering?
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