No CEL or limp mode. Previous to run, refueled at 1/2 tank, bringing mixture down to E14. Pulled charge pipe, cleaned, and reinstalled. Run felt a bit stronger this time, but there are many stutters as it pulls through the revs. Not pulling "cleanly". If resetting the charge pipe had a positive effect, is it worth changing the o-ring? I lubricated it, but it slipped on easily.