I just bought an 05 F250 and love this truck. I bought it with 79800 miles on it and it now has about 84000. I think the truck runs great with the acception of a few issues I would like some help on. 1.) Lack of power and preformance when the engine is cold. 2.) Fluttering or chirping noise when coasting and I tap the accelarator. 3.) Black smoke on take offs. The black smoke just recently started after I had the latest Ford flash done. Never used to do that. Thanks for the help.