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Jefferson posted a topic in Operation and Maintenance: 450 Model, 2005-2006, dieselHello all, my 2005 CDI is having issues in 6th gear. Monitoring boost in gears 1-5 seem to be normal. When I shift in to 6th gear the car will make around 4lb of boost at roughly 2,000rpm and I eventually have to shift back into 5th to maintain speed. I plugged my Delphi scanner in and there is no codes. I had pulled and inspected the inter-cooler along with all pressure piping. The wastegate tension is tight and lubed up, EGR is clean, Clutch actuator has been inspected and lubricated.Has anyone seen this in the past, is the other parameters that i should be monitoring? TIA