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I have had cold start bucking for a while. I find that going to normal rather than power sensitivity for the throttle pretty much eliminates it. However, I have a pressure sensor on order so I will be installing that within the week. I bought it not because of the bucking on cold start at low speeds, but because of codes for the system running rich on both banks.
The codes were coming up every day or two. I replaced the primary 02s last week and the codes have not returned, but I suspect they will. One thing at a time.
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