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Miss/stumble at any unloaded rpm range when warm

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Guys ive had this issue for a good year,  ONCE the truck gets warm it acts Real missy at idle in Park, and any unloaded rpm range. ONCE i. Put a load on the engine it doesn't mess up. Does not mess up when first start either.   Changed injectors 3 times no change, New vp44 2 months ago. No change 


No codes.    Nothing seeems out of place. 

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