so i just moved to Colorado and now live at 7980 ft ( used to live by the ocean )**** update 1982 300cd om617 turbo**** on the trip out it ran worse and worse the higher we went starting harder and smoking more, then refused to run. did a lot of reading and im going to do all filters,and try checking chain stretch and drip timing, already did the valve adjustment ( almost all were tight) and started removing everything that doesnt make it run. i dont feel the need for ac or cruise control pretty much anything, but my main question for this tread is , what tricks or tuning have you diesel guru's found works good for high altitude.