Join Date: Oct 2011
Thanked 18 Times in 14 Posts
The reason your truck is faster when you lightly step on the throttle is because you are building heat and pressure to spool the turbo. When you just lay into it and dump black smoke you are typically over fueling and putting out the heat and pressure.
To fix this you need to tune your AFC, get afc live, or learn to drive it with your foot.
This is a common problem and is what makes driving a 12v different from many other diesels with electronically controlled injection.