Re: Jerky Steering.. .
I had a very similar problem with mine last winter and there was a very cheap easy fix.
On the left side of the engine there is a steering shaft running from inside the car. On the shaft there are 2 universal joints. Spray the crap out of them with your favourite lube (WD40 etc.) This solved my issue immediately.
There is also the small rubber o-ring on the bottom of the power steering pump which can wear out and let air into the system but since you replaced the pump the o-ring was probably replaced as well.
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