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Ok I have a 2005 f250 6.0 4x4 with 115000 miles. the truck will lose power and RPM goes to 1000 no higher in drive then in park it will rev up with a lot of gray somke not black. i can turn off the truck and start it drives fine or waite a few sec. and fine. Cleaned EGR it was bad is this my problem i am lost due to the gray smoke and and RPM at 1000 i did not see this in EGR threads.
Changed the filters thinking it would fix it no luck. No CEL but dont have a code reader. Will autozone pull codes for this truck, i know they can not on my 2001. and dont want to $100 at dealership.
Are you loosing coolant? I'm not talking a visible leak but do you need to fill up the degauss bottle once in a while? That sticky oily crud on your egr valve could be a mixture of coolant and soot.