I have a 2003 Chevrolet 1500hd with a little over 90k miles on it. I was in Colorado and pulling an aluminum cargo trailer with motorcycles in it to the park and I had to pull it in first great in order to make it up the hill. It was even bogging down to 2k rpms. There are no CELs or any other warning lights to speak of. Please help. I am an only owner and treated it with tlc. Let me know what I can do to revive this beauty.
You'll have to get it on a scanner and monitor the motor vitals to see what is going wrong. Someone who knows what they're looking at needs to be involved.