As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
LEFT ENGINE FLAMED OUT AT FL 43 WHEN FIRST OFFICER ADJUSTED POWER LEVER TO SYNC ENGINES. ENGINE RESTARTED, ALL PARAMETERS NORMAL. INSPECTED COMPRESSOR INLET AND TURBINE AREAS FOR FOD. PERFORMED GROUND RUN AND ACCELERATION CHECK PER G.E. MM. DETERMINED TOO RAPID MOVEMENT OF POWER LEVER CAUSED FLAME-OUT.