I have a `01 2500 Cummins. About 8 months ago there was a dead spot at
about 35 mph, the tach and speedometer would fluctuate then continue to
speed up. About 4 months ago the motor seemed to lack power, then
slowly would not respond to any MASHING of the accelerator pedal at
all. I would have to shut it off, wait for the light to go out then
start it up and it would run fine. Then I took it in to dodge and they
said the fuel pump in the tank and the injector pump were both bad,
code P0216 or 18 I believe. Anyway, it was still less than 100,000
miles, so they changed it for free.

I am wondering if anyone else had experienced similar problems with
engine lag. And if dodge/Cummins doesn't want to replace a known faulty
item. By the way there aren't any new injector pumps out there, only
rebuilt ones. Total cost if it was out of warranty - about $3500.