Had this car for 3 yrs with 133500 miles. Started having steering issues( no power steering at low speeds, really hard to turn steering wheel with no indicators that its about to happen, intermittent). Found a TSB that requires a power steering pump change to a higher pressure unit, 2006 only. Changed out the pump. No binding in the steering or suspension. Checked the throttle by wire and everything seems to be OK. Any answers? THX