APU IS WEAK AND IGNITION CIRCUIT BREAKERS ARE OUT. ENG DOESN'T START FIRST TIME AROUND. SECOND START IS SUCCESSFUL BUT TORCHES. DEADHEADING CREW MEMBER NOTICES AND STARTS EVAC. 1 PAX INJURED.

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DURING #2 ENG START AFTER PUSHBACK; ENG TORCHED AND A UNIFORMED COMMUTING FLT ATTENDANT INITIATED AN EVAC WITHOUT MY KNOWLEDGE. MAINT ON THE HEADSET ADVISED US THAT EVAC WAS IN PROGRESS. I IMMEDIATELY SHUT ENGS DOWN; MADE A PA TO REMAIN SEATED; AND CALLED FOR FIRE AND RESCUE EQUIP. THE REMAINING PAX DEPLANED NORMALLY THROUGH L1 DOOR AIRSTAIRS AND WERE ESCORTED TO THE TERMINAL. THE ACFT WAS SECURED AND AN APPROPRIATE LOGBOOK ENTRY WAS MADE. SUPPLEMENTAL INFO FROM ACN 467123: ACFT WAS SCHEDULED FOR ROUTINE BORESCOPE ON #2 ENG. I ASSISTED IN OPENING UP THE ENG COWLS AND THRUST REVERSERS FOR BORESCOPE AND THEN WENT TO WORK ON THE EXTERNAL PWR DOOR. THE EXTERNAL PWR WAS TURNED OFF AND CORD REMOVED TO GAIN ACCESS TO DOOR LATCHES AND HARDWARE. UPON COMPLETION OF BORESCOPE WE REINSTALLED ALL REMOVED PLUGS AND IGNITERS. FINAL INSPECTION WAS COMPLIED WITH BY INSPECTOR ASSIGNED TO ACFT. ACFT WAS RETURNED TO NORMAL CONFIGN AND PAPERWORK WAS COMPLETED. DUE TO THE ACFT BEING PWRED DOWN; IGNITION CIRCUIT BREAKERS WERE NOT PULLED BY US. THEREFORE; THERE WAS NO REASON TO RESET THEM UPON COMPLETION. AT PUSHBACK; #2 ENG START WAS ATTEMPTED BUT STOPPED FOR INSUFFICIENT APU AIR. #1 ENG STARTED NORMALLY. UPON SECOND START ATTEMPT; #2 ENG HAD SUFFICIENT N2 SPD BUT NO IGNITION. CAPT WAS ASKED BY MECH ON HEADSET TO CHK IF CIRCUIT BREAKERS WERE IN. THE CAPT FOUND THE CIRCUIT BREAKERS OUT; RESET THEM; AND ATTEMPTED TO START #2 ENG AGAIN. THE START WAS SUCCESSFUL WITH TAILPIPE TORCHING APPROX 5 SECONDS. AT THIS POINT I NOTICED AFT SLIDES DEPLOYED AND PAX EVACING. I GOT THE MECH ON THE HEADSET'S ATTN AND HE ADVISED THE CAPT THAT AFT SLIDES WERE DEPLOYED; PAX WERE EVACING; AND TO SHUT DOWN ENGS. ENGS WERE SHUT DOWN AND REMAINDER OF PAX WERE DEPLANED USING AIRSTAIRS AT FORWARD ENTRY DOOR. THE FLT WAS CANCELED. THE PROB WAS CAUSED BY IGNITION CIRCUIT BREAKERS BEING PULLED AND NOT TAGGED BY AN UNIDENTED PERSON. THE SOLUTION IS HAVE MECH AND INSPECTOR SIGN BLOCK FOR RESETTING CIRCUIT BREAKERS (IGNITION). REQUIRE AN IGNITION CHK DONE AFTER COMPLETION OF BORESCOPE.