We are the original owners of our 2005 Prius. I don't know how many miles ago, the hybrid battery was replaced. The car now has 230k miles on it. Ever since then, our prius has had problems with sluggish acceleration. Looking at youtube, I think that the problem could be the catalytic converter being clogged. Have you guys ever removed and cleaned the cat, or how does one go about this on a prius? It could also be the spark plugs, idk, I'm not sure when the last time those were done was.