It is probably a lack of fuel, try the simple stuff first like changing the fuel filter. The lift pumps in the 01 is prone to failure at about 80000 miles, it is a good idea to install a fuel pressure gauge or an aftermarket electric fuel pump, it will save the injection pump, and that is the expensive one.
It is under the dash on the driver side.
is the ecm on a dodge 2001, 2500 diesel hard to replace??
No such part
AnswerYes if you have the moter mounts from the 2001 moter.
In 2001 the Ram 2500 diesel did not come with a cat. it has a resonator and a muffler. the thing under the cab that looks like a cat is actually a resonator. so no they are not required
who ever said that a dodge ram diesel does not have a servo it is not true. I have a dodge diesel 2001 and it has a servo and the answer to this question is it had a vacuum leak in the servo vacuum line, changed that and cruise control worked great. the servo is under the drivers side battery.
This is just a guess but No, everthing changed between those two years.
Inline 6
Green
In the side of the block,behind the starter.
R134a
47re