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Re: Stumbling after start up
The 02 heater is controlled on the ground side by PWM (this is according to an article on 02 sensor heaters), so the pulsing wouldn't completely surprise me.
Same article references this: "On many GM models it can be done with the sensor hot, and the PCM will relearn the real value at the next cold-start."
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'66 Short Step / SD Tuned / Big Cam LQ4 / Backhalfed /Built 4l80e / #REBUILDEVERYTHING 
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