ACFT EQUIP PROB ENG WENT TO FULL THRUST AND COULDN'T BE CTLED.

Narrative

HAND FLYING A B757 ON RWY 25L ILS LAX. (GEAR DOWN; FLAPS 30.) AT APPROX 1100 FT AGL IN IMC; NOTICED A L YAW AND ROLL; DRAMATIC PITCH UP AND AIRSPD INCREASE. INITIATED A 2 ENG GAR. BECAUSE OF OUR LOW GROSS WT; THE GAR PITCH ATTITUDE WAS APPROX 22 DEGS ACFT NOSE UP. THE CAPT WAS OVERLY CONCERNED WITH THE HIGH PITCH ATTITUDE AND WAS DISTRACTED FROM DETERMINING THAT THE R ENG HAD ACCELERATED TO OVER 101 PERCENT N1 WITH NO THROTTLE MOVEMENT. WHEN I RETARDED THE THROTTLES AT THE MISSED APCH ALT; THE ACFT AGAIN YAWED AND ROLLED L. I ADVANCED BOTH THROTTLES TO MAINTAIN CTL OF THE ACFT. I CALLED OUT THE R ENG'S CONDITION TO THE CAPT AND ADVISED WE SHUT DOWN THE R ENG. THE ENG WAS SHUT DOWN PER SOP. AN EMER HAD BEEN DECLARED BY THE CAPT DURING THE EARLY PART OF THE GAR. ALL APPROPRIATE CHKLISTS WERE COMPLETED; THE CABIN WAS PREPPED FOR EVACUATION; AND AN UNEVENTFUL SINGLE-ENG APCH AND LNDG WAS ACCOMPLISHED. THERE WERE NO INJURIES ON DAMAGE TO PAX OR ACFT. I FEEL THE CAPT'S UNWARRANTED CONCERN OVER THE ACFT'S PITCH ATTITUDE DURING THE GAR (HE ACTUALLY PUSHED FORWARD ON THE YOKE AND FOUGHT ME TO REDUCE THE PITCH) (HE NEVER SAID; 'I HAVE THE AIRPLANE.') PREVENTED HIM FROM ACCOMPLISHING THE PNF'S DUTIES OF RECOGNIZING AND CALLING OUT THE PROB WITH THE ENG. THE ENTIRE 'EVENTS' DURATION WAS PROLONGED BECAUSE 2 PEOPLE WERE FLYING THE ACFT AND THE PNF WAS NOT MONITORING THE ENG INSTS PER SOP.