I have heard of this a few times in the past on all different types of cars. The most common problem that I have heard of is a clogged catalytic converter.
You did not say what the year of the 2500 was. Need to know.
behind and above glovebox.
you might try www.haynes.com
The 2014 RAM 2500 has a V8 engine.
The 2011 RAM 2500 has a V8 engine.
The 2012 RAM 2500 has a V8 engine.
The 2013 RAM 2500 has a V8 engine.
350 5.7l are most common 305 5l is the best engine to be equiped with the g serise vans
Under the hood in center of firewall above engine.
The 2013 RAM 2500 has a 5.7 L base engine size.
The 2011 RAM 2500 has a 5.7 L base engine size.
The 2012 RAM 2500 has a 5.7 L base engine size.