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I have an AT with the Edelbrock kit and v25 tune for flex fuel and am having a rough idle. Sometimes sitting at a light, ignition advance timing is -2.5 deg. STFT is high, like +25%. Load is a little higher than normal. Vacuum sometimes is only -7psi vs the normal -10psi, so I imagine the bypass valve actuator is partially open, flooding the cylinders with compressed air and the ECU is pulling timing. If that sounds plausible, where could I be having vacuum issues?
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