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Were all the parts replaced Mercedes / oem brand?
I hated the year I worked on sprinters, the '06 and older seemed to go into limp mode at the drop of a hat it felt like. Had one with a new aftermarket air filter, but it flowed so little the pressure sensor in the air box would show 7" of vacuum just as it went into limp. It was more common to replace a newer looking aftermarket fuel filter with a mecedes one, and have that keep it out of limp.
But what I'm more suspect of, is if you have a good fuel filter, but the wvo requires more vacuum to get through the filter, or upto the filter. If you ordered a lift pump, I'd put that on before digging much further. Otherwise, just keep running straight diesel for now
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