What was found
AFTER TAKEOFF AROUND 500 FEET, BOTH ENGINES THRUST FLUCTUATED UP AND DOWN, THROTTLES MOVED BACK AND FORTH, AND N1 BUGS WENT TO 0. A/T LIMIT ANNUNCIATED ON ANNUNCIATOR PANEL. MAY HAVE BEEN SOME OTHER ABNORMAL INDICATIONS, BUT ONLY LASTED A FEW SECONDS BEFORE EVERYTHING RETURNED TO NORMAL. MAINTENANCE PERFORMED A/T BITE CHECK PER AMM PROCEDURES - NFF, "NO FAULT" DISPLAYED. PERFORMED PRECAUTIONARY RESET OF A/T COMPUTER POWER. PERFORMED RECHECK OF A/T COMPUTER - REFERENCE TASK 22-31-10-705-007 - "NO FAULTS" DISPLAYED.