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Did you connect the controller to your ecu? If so, how did you wire it in? Did you change any settings on your ecu/tune file? You didnt mention the wideband or any of that in your first post.
Car runs fine, change something, car doesnt run fine. Problem is related to the change you made.
We can only reply to the information you decide to share.
Megasquirt saves your tune file when you change it usually. Try rolling back your tune to before you made changes (if you did) and see if that works.
If you wired the wideband controller into your harness its possible you messed something up there too.
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