The Isuzu NPR is a light duty commercial truck. It is available with a 4 cylinder turbo diesel engine or an 8 cylinder gasoline engine depending on year of the vehicle.
If you have an automatic you probably have a 450-43le transmission. If your tranny goes it it usually cheaper to replace it with a GM TH700-r4 There are adapter kits available. If you have a manual...
The pedal clicks when it's down all the way, only hit that when you really need the acceleration. I burned a whole tank on it, and got a difference of about 2 MPG. If you look on the dash of the...