SAAB 340 AUTOPILOT PITCHED DOWN ON FINAL APCH. RATE OF DESCENT WAS ARRESTED AFTER AUTOPILOT WAS DISCONNECTED. A STALL WARNING RESULTED AND A GAR WAS INITIATED BY THE FLT CREW.

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UPON APCH INTO ZZZ ON THE ILS; WE WERE CLRED FOR THE APCH AND CLRED TO LAND. WE WERE ASSIGNED TO MAINTAIN A SPD OF 180 KTS UNTIL XXXXX AND AN ALT OF 4000 FT. DSCNT AND APCH CHK WERE COMPLETE WITH A POSITIVE ID ON THE LOC FREQ. WE BROKE OUT OF THE CLOUDS AT 4000 FT AND APPROX 1 MI FROM XXXXX. THE FO WAS FLYING WITH THE AUTOPLT ON AND THE LOC ALIVE AND CAPTURED. WE WERE SHOWING THAT WE WERE HIGH ON THE GS; 2 DOTS HIGH. WE CONFIGURED THE ACFT WITH GEAR DOWN AND CONDITION LEVERS MAX. ACFT SPD WAS SLOWING TO 160 KTS WHEN THE ACFT MADE A NOSE DOWN PITCH AND A RATE OF 4000 FPM DSCNT NOTED. I TOOK CTL OF THE ACFT AND DISCONNECTED THE AUTOPLT. I STARTED A GRADUAL PITCH UP TO DECREASE THE RATE OF DSCNT. UPON RECOVERING THE ACFT IN THE DSCNT AN AVIONICS WARNING ON THE CWP WAS NOTED. I NOTED A YELLOW GS FLAG ON MY EADI. I CONTINUED WITH THE PITCH UP AND DECREASE IN DSCNT RATE. ONCE ACFT WAS STABLE I XFERRED THE CTLS BACK TO THE FO AND NOTIFIED ATC THAT WE WOULD NEED TO GO AROUND. AT THAT POINT WE RECEIVED A STALL WARNING SHAKER AND PUSHER. I TOOK CTL OF THE ACFT AND NOTED THAT MY AIRSPD WAS INDICATING 120 KTS. I STARTED WITH THE STALL RECOVERY PROCS; PWR WAS SET TO MAX. NO OTHER CONFIGN CHANGES. I STARTED TO CLB AGAIN IN THE STALL RECOVERY WHEN A SECOND STALL WARNING WAS NOTED. I LOWERED THE NOSE AND CONTINUED WITH THE STALL RECOVERY PROCS. I LEVELED THE ACFT OFF AT APPROX 1700 FT AND ALLOWED THE AIRSPD TO INCREASE PAST 160 KTS. I BEGAN TO CLB UP TO 3000 FT. I THEN STARTED TO CLEAN UP THE ACFT GEAR RETRACTED UP. WE RECEIVED A TOO LOW FLAPS AND TOO LOW GEAR WARNING. WE CONTINUED TO CLB AND REQUESTED TO MAINTAIN VISUAL CONDITIONS AND VECTORS TO THE ARPT. AFTER WE CLBED TO 3000 FT AND CONFIRMED THAT WE HAD CTL OF THE ACFT; VECTORS WERE GIVEN FOR THE VISUAL. ATC NOTIFIED US THAT THEY HAD DECLARED A LEVEL 2 EMER AND TRUCKS WOULD BE AVAILABLE ON LNDG. ON OUR VISUAL APCH THE AUTOPLT REMAINED OFF. ON FINAL APCH WE STARTED TO RECEIVE ERRATIC GS INDICATIONS. VISUAL APCH TO LNDG MADE WITHOUT FURTHER INCIDENT.