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My 2004 6.0 has been doing this for a while now. In the morning when the engine is still cold, once I get into overdrive on the freeway it starts bucking. The only way to get it to stop is to kick it down out of overdrive or wait for the engine to warm up. Once the engine is at regular temp. it completely goes away. I have tried oil and fuel additives to try to clean up the injectors but have seen no difference at all. Any thoughts would be greatly appreciated. I am stumped!!!