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Rob001

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  1. Rob001's post in 996TT engine stutter under load was marked as the answer   
    As a follow up the stutter mysteriously cured by itself... kind off..
    I suspect is was bad gas as the car was not used for a while as I'm often working overseas. I know that the ECU is flashed (unknown tune to me by previous owner) and I think the stutter was related to too much timing and the knock retard due to bad fuel. As a preventive measurement I changed the diverter valves (710N) and pre cat wide band O2 sensors. Next will be a new UMW tune based on a proper data log Kevin is selling.
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