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Original post by: Orlen ,


Have the actuators checked, I have never experienced that when accelerating with my c15 after it has gotten up to operating temp but have had similar problems on hard pulls. if you are experiencing it when you are first getting started or after the truck has been turned off for a while it may be do the the engine being cold, I was told that the injectors are not all firing until the engine gets to operating temp causing hesitation, smoke blowing out the stacks and loss of power