As above, the EGR might be dirty, or a bad MAF ( but this will throw a code) or a Waste gate transducer that is leaking or bad ( but this should give some code too)
Olivier

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E300TD year 2000. RUSTY SOLD
cost a fortune to maintain on the road
but run well on WVO
Second Merc died due to corrosion ( NOT rust) How can mercedes get away with that for so long?
Third lasted a month then went away...
Fourth now... Corroded too...