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Much appreciate the feedback. I understand that retarding timing will drop power. Unclear how how that leads to the ECM to disregard pedal position, closing the throttle momentarily, then back to pedal input, repeat 2-3 times a second. I will share with the dealership, but unclear what part(s) to replace. Bad sensors? Bad blower? Bad blower cooling circuit or pump?
We did check and see temp drop across the s/c heat exchanger.
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