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prior to installing the 02's I scanned it to find out that while reving the engine to about 2,000 RPM's and droping it to idle the left bank was still showing about 500-600 millivolts while the right bank was showing around 100-150 at idle. Eventually the left bank 02 would come down around 100-150 wher it should be, but during the interum i was getting a misfire on the #1 and #3 cylinders, im guessing because the injectors were dumping too much fuel on the left side, which would explain why my gas mileage is so poor, but hey its better than running lean right? Now upon removing the 02's it dawned on me that I used extenders when installing the headers, im sure the 02's is actualy fine and the extenders is making it lazy, i have actualy read about this on tech, now do I install new 02's using the extenders or buy bosch 13111 sensors to avoid this in the future, hummmmmmmmmm...
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