It seems that this engine has sludge build up issues. Can anyone tell me how to succesfully "DE-SLUDGE" this engine. How can I check to see if this is causing my engine to have a rough idle and no power. And last but not least - what is and how do you perform a "Leakdown Test"? After reading through 181 different threads in this forum, I am confident that you guys / gals will be able to answer my many questions. My truck and I await the rush of responses.