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I'm not sure if this is possible since you have ECU-Tek flashed on your car, but maybe you can have someone local with an OFT un-marry their device and flash it onto your car to see if that stage 2+ tune presents the same issues?
Also I believe most of the vacuum lines are underneath the intake manifold if you wanted to take a look at that. Do you get bad MPG when the car isn't running right?
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