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03 6.0 programmer, straight pipe exhaust, intake, egr delete, etc. When at idle you can hear in the exhaust and feel sitting in the truck what feels like a misfire but it doesn't set a code. Also when cold under moderate to heavy acceleration the truck stumbles for a few seconds sometimes more before taking off. It still runs fine but seems like something is holding it back. Ive heard that it could be injectors or a sticking waste gate. What do you guys think???