I know this probably sounds like and almost stupid remark but - When was the last time You changed Your air filter?
A couple of weaks ago I thought my car was much to sluggish (1984 500 SEL) but after I changed the airfilter it was much better. The old filter didnīt look dirty and was only about a year old with maybe 5000 miles on it.
Good Luck,
Mikael Westerberg
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