hi mate,

not on e300 but on Vectra turbo diesel also,I had similar thing
it was bad intercooler hose and some old overfill hoses.

not much sense but when changed those, car was alive again

cheers

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w126 500SEC gen II euro, powered by OM617 turbo stolen from 84 300SD 2.88 diff,EGR blinded
next wish/project: w114 coupe OM603 powered