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A weak cylinder absolutely will smooth out with revs. Don't believe it? Crack an injector line and rev the engine up to 2 grand. You'll swear it was "smooth".
The "puff" noise in the exhaust is a clue...you probably have worn valve guides/seats causing a compression leak.
Compression and/or leakdown test should be in your future to diagnose further.
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Current stable:
1995 E320 157K (Nancy)
1983 500SL 125K (SLoL)
Gone but not forgotten:
1986 300SDL (RIP)
1991 350SD
1991 560SEL
1990 560SEL
1986 500SEL Euro (Rusted to nothing at 47K!)
Gone and wanting to forget:
1985 524TD 167K (TotalDumpster™) [Definitely NOT a Benz]
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