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  1. G

    idle's great. wont rev 15-2000 rpm

    So I just rebuilt the 4.0 in my 97 xj. went to start it up for the break in, and it ran great. until it went to closed loop. now it idles like a dream but any gas I give it makes it stutter, plus wont go past 1500 rpms. its also running super rich. I figured o2 or position sensor but no codes...
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