Chevrolet Blazer Picture by LesMyer | 9024064 |

I was right about the STFT. It does cycle up and down with the O2 sensor, but doesn't seem to do it at idle. This is at 2000rpm in park. I saw it cycle from about -5 to + 5

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LesMyer January 17, 2018

I was right about the STFT. It does cycle up and down with the O2 sensor, but doesn't seem to do it at idle. This is at 2000rpm in park. I saw it cycle from about -5 to + 5

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1996 4.3 Timing issue

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