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You need to drive it in a mixture of situations, i.e. traffic/highway/various speeds, and also will need to turn the car off and restart it again a few times. There are certain procedures to get the monitors to run in a quick manner, though I'm not sure what they are in a GM. After I had my tune, I tried getting a sticker after about 65 miles and didn't pass. I went back a while later and all was good.
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