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engine stutter at cruising speed

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Old 10-06-2016, 01:03 AM
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W140 s500
engine stutter at cruising speed
I recently inherited an s500 from my family. Its in perfect condition and garage kept since 1996. It has 102xxx miles. The only issue that it currently has is a stutter in the rpms, cruising at 35-45 mph. It doesn't happen all the time but when it does it is very annoying and I'm sure it is affecting the already poor gas mileage. It is also a bit hesitant off the line at times but not always.

My research has led to possible MAF or a bad coil. Recently changed spark plugs with no avail To fixing the issue. Noticeable better performance though.

I have no codes when checked.
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Old 10-12-2016, 09:59 PM
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C43, S500, S320, 280 SEL 4.5
The probability is higher for a bad coil. It would help if you can describe what happens under heavy acceleration as that could point to a MAF issue.
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