I have a 1997 Dodge with a Cummins Diesel and a five speed. If I lug the RPMs below 600 RPM, when I let the clutch up, the exhaust will smoke severely until I reach about 1000 RPM. Then between 2000 and 2500 RPM, there is very, very little power and very little smoke at all. If I slip the clutch when taking off (not letting the RPMs drop below normal idle), there will be very little smoke and a
lot of power between 2000 and 2500 RPM. The engine did not use to act like this and it has not been tampered with. What is wrong with this engine?
