Medium and Heavy Trucks
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ok try recalibrating the throttle position sensor.To do this engine off than put the key in the on position and press the throttle 3 times slow than key off. as for the low power check for loose or misaligned boost / charge air cooler hoses/clamps from the turbo use water if needed to watch for bubbles ensure the actuator is working properly on the turbo, if not suspect the turbocharger control valve.