2005 Duramax HD 2500, 6.6 diesel has had fast idle and is noticeable in gear at stoplight, over summer travels I have noticed the fast idle is pulsating and becoming an issue. I’m good at on gas engines, not much experience on diesel. Look forward to community’s help. Thanks.
My first diesel a 2005 Duramax 2500HD long bed four wheel drive. I purchased with 42k miles now has 85k, I tow a 32 ft 5th wheel approx 12k lbs. I have done all maintenance so far, engine oil,fuel filter,air filter, transmission filter change internal ,external and flush fluid. Has been a great...