At 170K miles, I would suggest a complete tune-up … change everything that needs to be changed regularly … jz78817 mentioned valve seals and piston rings, if you haven’t replaced these then they’re probably shot anyway, the extra oil is just making the problem worse …
Yes. Based on the fact that you overfilled it combined with the symptoms you list, I would say you need to drain the oil and fill it again to the proper level, NOW.
If you have too much oil, instead of draining down into the oil pan it gets up into the moving parts of the engine and gets whipped into a froth. When you have frothy oil, it doesn’t flow where it should, and it’s basically about as bad as having no oil at all. If you haven’t ruined your engine already, you are in severe danger of ruining it if you continue to drive it. So get this taken care of ASAP.
Back when I drove race cars at a local short track, we ran the engines 1/2 to a full quart over the full mark. This was to keep the oil pickup in oil during hard cornering and acceleration. We ran stock engines and were not allow dry sump oiling systems that are used on most racing engines. The only engine I ever had a problem with running over full was a 350 Buick engine. Removing the oil pan and adding a home made windage tray solved the problem of the oil getting whipped into foam by the crankshaft.