Main fuel filter? -But that would act as a "starved-for-fuel" symptom in acceleration.....

I started changing-out my 99 E300's main-filter every 10K miles - to stay ahead of that issue. Because my 83 300SD's main had displayed the "starved-for-fuel" symptom @ around 10K - I was on-the-road in Birmingham, AL., and had to change it out at the motel - so, I started the 10K regimen.