A CRJ200 ON TAXI OUT HAD CAUTION CHIME MESSAGE 'EICAS COMPARATOR MONITOR' ENG INDICATORS ON #2 ENG BLANK. INDICATORS RETURNED WITH ITT IN RED 990 DEGS. ENG SHUT DOWN.

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DURING TAXI TO RWY 31 AT LGA; BOTH ENGS RUNNING ON TXWY A; HOLDING SHORT OF TXWY V. TAXI CHKLIST WAS COMPLETE. BOTH ENGS HAD BEEN RUNNING APPROX 5 MINS. WE HAD A CAUTION CHIME MESSAGE 'EICAS COMPARATOR MONITOR.' AT THIS TIME; THE GAUGES FOR #2 ENG WENT BLANK. THE ROUND GAUGES (N1; N2; ITT) WERE THERE; BUT HAD NO NUMBERS ON THEM. 5-10 SECONDS LATER; ENG INDICATIONS REAPPEARED. N1 AND N2 WERE READING ABNORMALLY AND ITT WAS IN THE RED. CAPT THEN SHUT DOWN #2 ENG. WE DECIDED TO TAXI BACK TO THE GATE FOR MAINT. AS WE TAXIED BACK; I ASKED RAMP CTL IF THEY SAW ANYTHING ABNORMAL WITH OUR #2 ENG/R SIDE; AND THEY SAID NO. AS WE WERE ROLLING INTO SPOT X ON BLAST FENCE; WE SMELLED A STRONG BURNING ODOR. CAPT SAID TO NOTIFY THE FLT ATTENDANT WE WERE EVACING THE ACFT. I CALLED THE FLT ATTENDANT AND TOLD HER TO EVAC PAX OUT THE MAIN CABIN DOOR AS SOON AS WE CAME TO A STOP. CAPT TOLD ME TO GO ASSIST IN GETTING PAX OFF THE ACFT; TO WHICH I DID; AND 12 PAX WERE EVACED WITHOUT INJURY OR INCIDENT. CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO: THE RPTR STATED THE TAPES WERE ANALYZED OF THE #2 ENG PERFORMANCE AND IT WAS NOTED THE ENG HAD A NUMBER OF STARTING IRREGULARITIES AND COUPLED WITH THE OVERTEMP EVENT THE ENG WAS CHANGED. THE EVAC ON THE GATE WENT SMOOTHLY AND NO INJURIES WERE INCURRED.