Problem RESOLVED! It WAS bad fuel, and evidently I did put gas in my diesel tank, per the station where I purchased it.
Got up this morning and drove 1.5 hours up the mountain, grabbed a cup of joe, then back down using up more than half a tank. Stopped at Valero when back in town and refilled my tank and I have my beautiful powerful clackity-clack acceleration from my Cummins 6.7 back with no shudder/stutter at any RPM.
Contacted the station where I purchased yesterday and they said they had almost a dozen conplaints/calls and were in the process of having their diesel pumped out with another tanker on the way to refill.
Evidently the last delivery, the driver emptied premium into their diesel storage by mistake. They asked for the transaction id from the receipt and are crediting back my purchase and want me to keep track of any "fuel" related issues. The owner will handle any costs that may occur from this for the next 90 days. I'm just happy to be back
Whew.
