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Check your Battery voltage. Sometimes a dead cell causes weird things to happen with sending units and electrics. Car will start normally under unstressed conditions but it can reek havoc on systems. I had the fuel gauge and traction control fail in my Lexus GS. All caused by a bad battery cell. New battery fixed all ailments.
Not sure about your power issue. Could be MAF related. Without software, you're at the mercy of your mechanic.
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