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  1. surging at shift, bunch of codes. '97zr2

    262ci Forum (4.3)
    Thanks for this great site. i think i've read most of the posts dealing with engine surging, but mine has trouble codes that are different. '97 zr2, 4.3, 250k miles. has been surging badly at shift points when 1600-1800rpm. idles fine. codes are listed below. thanks for a review suggestions...
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