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a/c pressure sensor's readings could be bad
i have my wideband O2 sensor hooked up to the a/c pressure sensor 0-5v line, so if i accidentally turn on the a/c (which i don't even have anymore) it will think that the wideband's O2 voltage readings (which fluctuate quite a bit) are the A/C pressure readings, causing the idle to move up and down all crazy to compensate for the A/C load that doesn't exist
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