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Iv been having the same problem, when i first start the car for the day it starts with no problem then the idle falls and you hear it start knocking then it idles up. Lately now that its cooler outside when im driving and i stop at a light the car almost stalls comes up then idles down real low, voltage drops real low, but if i turn the A/C on it idles fine. No hesitation during acceleration or reving engine.
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