when i had that same problem it turn out my fuel distributor went bad.the part i keep asking and never get an answer
why when the eha reads rich the dutycycle reads lean just like in your pictures.then when the eha reads lean the dutycycles read
steve said worried about the eha reading but all the info refers
to x11 for all diagnostic if you modified you air intake to bring in more air then you need to richen the fuel a little to match the air coming in. more air than fuel choke the engine and vise versa
also why is it everyybody discribe the same exsact problem
but the fix is different .