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Have you added as much fuel as you possibly can in with the AFC to try to richen it up under load at least? Have you added some fuel with the AFC in the regions with part throttle and lean rev up.
You should be aiming for 14.7:1 AFRs at idle and vac revs....MAX
You should be aiming for 11.5:1-12.0:1 AFRS under load or boost.
If you have added in all the fuel you can with the Afc then your problem is your injectors may not be sufficient. End of story get a used PFC L Jetro, throw that on there and go from there if you want real management control etc.
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