Your running 20 psi with no fuel management and no 550s at least? Seems like thats why your hitting fuel cut... As for the creep talk to Jet or Raptor about porting the O2 if its not done right, or if you need a bigger WG flapper installed.
You must be running really lean wth no fuel management and the O2 guage isnt going to show much... maybe really lean vs rich...
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