Stumble on cold start

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  • JettaRed
    Moderator
    • Jun 2026
    • 1

    #1

    Stumble on cold start

    My 2015 SL400 (M276.825) will stumble a couple of times on cold start, such as only in the morning. Fuel rail pressure shows normal at idle, as well as the in-tank fuel pressure (low pressure fuel pump). No misfire or other codes. Any ideas?
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