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rough idle after engine swap

almighty

New member
so i replaced my engine and trans last week and i have an issue with the way the new engine idles, it seems kinda rough, and trips a code "bank1 too rich" i have a really cruddy scanner so im not sure what is causing this, but would a knock sensor do this? if so i could prolly change it easily enough, but dont wanna do this if its not needed.

any advice would be welcome
 


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