Try Seafoam available at your local auto parts store. You either have a moisture build up in your fuel system, or a carbon build up in your exhaust system. The Seafoam additive will get the moisture and carbon out yu may also try higher octane gas 89 or 93 for a tank or 2. This is a common problem with the 5.9 and 5.2 V-8 engine go to youtube type Seafoam for video
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