Date registered: May 2007
Vehicle: 2004 C230 Kompressor Sport Coupe
Location: Olympia, WA
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Out of gear, it might have a lower rev limiter. I don't have the C240, but some cars do that since there is not much reason to run up to redline while out of gear. But in gear, that really means something is wrong. My gut says MAF, but you should start by checking for codes. You need not just stored but pending. Bring the numbers, not what the person with the tool says they mean.