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Many cars are programmed so that the RPMs in park/neutral are limited. My wife's S80 behaves that way -- can't bring it above 4500RPM in P or N. You need to check it out on the road, not when parked.

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Q: Volvo s40 wont rev up over 4000 like a misfire its not the plugs or coilpacks what could it be?
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