im new to this forum and im having serious problems with my 2003 wrx bugeye.
first bogging and sputtering at high load and boost.changed fuel pump and still the same(used pump).
changed coils plugs O2 sensor still same problem
cleaned injectors and changed the seals and still the same.
also checked for leaks nothing at all
and the boost gauge is normal and stable
now its bogging and sputtering from 2000-4000rpm.
another thing, it doesnt sputter and bogg for the first like 15-20seconds on start up even if its cold or hot.whenever i turn it off then on it will act normal and smooth for the first 15-20 seconds.