Mine just started doing this after I replaced my actuator last night. I used a complete city diesel unit. Only does it when it’s warming up and the exhaust brake is on or all the time, idling, if your running the “whistle” tune. When it’s surging the boost raises and falls slightly along with rpm’s. I unplugged the MAP sensor and it smoothes up right away. Still stays at roughly 93% turbo position, still whistles, just no surging. Hmmmmmm
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