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I have exactly the same problem you described (the wall, the RPM, etc) in your original posting. It only happened after some hard driving or warmed up car. Took it to my local dealership and they identified the problem as the one of the catalytic convertors (RHS). You do want to get it replaced before the check engine light comes on but have your emissions tested now to see if the cat is still working fine. This may buy you a bit of time. The dealer tested mine and said everything is ok but i should do it sooner rather than later.
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