I have a 2005 Ram with the 5.9L and about 150k miles. Auto tranny.
This afternoon as I was pulling onto the freeway after filling my tank, I had a lack of acceleration. On the freeway, I could only go about 55 mph. RPMs maxed out at about 1500 and if I tried to accelerate, the little bit of power I had seemed to die. I managed to limp back home.
My guess is a bad turbo, but I had the turbo replaced about 50k ago. Any ideas or help would be most appreciated. Possibly a problem with the fuel system?

 

Were there any codes present when you checked?

 

I didn't have time to check...had to leave the next morning for a granddaughter's out of town wedding.

 

Sounds exactly line my situation. See my post near yours (( https://www.dieseltruckresource.com/...-p2146-333973/ ))
But, check your codes beforehand to be sure...