Without a little more explanation I can't answer on the RPM "problem" but, IMHO, the VX's engine does brake (Slow down) more than other vehicles I have driven. Like I said though, I'd have to have a little better understanding to what you mean.

Unfortunately, you do suffer from buying a used vehicle and you can almost count on things going "bad" as just from being driven differently can cause things to show up.

I've had my VX since day 1 and have had not one problem out side of a noisey t-case which was replaced under warranty and now a slightly slow passenger side window.. (I know DK, I need to fill out you poll and submit a complaint). Keep a check on things and once you get everything back to par, you'll be fine.