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
350 5.7l are most common 305 5l is the best engine to be equiped with the g serise vans
The 2011 RAM 2500 has a V8 engine.
The 2014 RAM 2500 has a V8 engine.
The 2013 RAM 2500 has a V8 engine.
The 2012 RAM 2500 has a V8 engine.
Under the hood in center of firewall above engine.
The coolant capacity of a 1988 GMC Vandura 2500 is approximately 16 quarts (or about 4 gallons) when including the radiator and the engine. However, this can vary slightly depending on the specific engine configuration and any modifications that may have been made. Always check the owner's manual or a repair guide for the most accurate information for your specific vehicle.
Right above the oil filter on the front of the engine. You can see it from the top, too.
The 2011 RAM 2500 has a 5.7 L base engine size.