I just made B100 and the car started doing the same thing. Fuel is very dirty, so I think your theory is correct about this. And the nozzles may need attention, as well.

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Thanks,
Mark in NC

"Spark plugs?...We don't need no stinking spark plugs!"
1985 300SD "Der Silberne Schlitten" 420,000 mi


Wish these were diesel:
2003 Ford Club Wagon 130,000 mi