My 2005 Chevy Impala's power stearing problem?
From the sounds of it, that pothole messed up your steering. Something is binding in the steering train, could be a damaged tie rod end, one of the other steering joints, or even the rack and pinion steering itsself. When it's binding, the power steering pump has to work too hard, slowing the engine down, making your lights dim because it's also slowing the alternator(on the same belt drive) and furthering your steering problem. You need to get it checked out immediately before something breaks and gets you into an accident. Remember, if steering linkage breaks, you have NO control of your vehicle, and it doesn't care if you're driving 70 mph on the highway.
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