I bought a 2012 Impala LTZ with 189K from Copart. I won it for $675, it was totaled for undercarriage damage. Just needs some plastic shielding replaced and a small gash in the metal repaired. Seems to be in decent shape otherwise. Pretty sure it needs a new power steering pump. It whines pretty loud and the power steering fells a little sluggish. I feel a small vibration when stopped in drive, but not in reverse. Seems fine in drive when it’s not stopped. Any ideas on what that could be? Needs a hell of a detail and some fresh fluids, but I think I did pretty good! Thoughts? Let me know what some common issues are and things to look out for. Thanks.