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Okay I went to Chevy dealer, forked out $100, he said I was not getting 5 volts to O2 sensor and that PCM was bad ($240 part + $180 install). I said no thanks, I went to auto store, new PCM $96 + installed myself. But, just as I suspect, NOT the problem, more wasted $$$. Even though O2 sensor is only 6 mos old, I will put in another and let you know what happens.
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