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  1. Problems / Dealer Service
    I have a superchip programer. Installed the 91 tune and ever since I have got warning lights ESP/BAS traction control off light. And, the U0401 Implausible data received from ecm/pcm. It also shifts very hard and seems to stay in gear way to long, or shifts in and out of overdrive constantly...
    ecm/pcm help! superchip u0401
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