ENPLANING PAX SUFFER FROM JET BLAST ENCOUNTER FROM DEP ACFT IN A TAIL TO TAIL RAMP ACFT PARKING PROC.

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ON THE MORNING OF JUN/SUN/92; MY ACFT; AN LGT; WAS PARKED ON THE RAMP AT GUADALAJARA; MEX; HDG WNW; TAIL TO TAIL WITH ANOTHER ACR LGT; FLT GDL-LAX PARKED ON RAMP. WE BLOCKED OUT AT AM14 LCL; ABOUT 20 MINS LATE. ASKED FOR PERMISSION TO START FROM GND CTL; STARTED ALL 3 ENGS AND ASKED FOR TAXI CLRNC FROM GND CTL. WE WERE INSTRUCTED TO PROCEED STRAIGHT AHEAD TO TAXIWAY 'G;' THEN TAXIWAY 'A' TO RWY 28. I PUSHED THE PWR UP ON ENGS 1 AND 3 TO APPROX 60% N1 AND WAS IN THE PROCESS OF ACCELERATING ENG 2 FROM 40% TO 50% N1 WHEN GND CTL TOLD US TO 'CUT OUR THROTTLES.' DURING ALL THIS TIME; MY GND TAXI GUIDE LADY WAS INDICATING COME AHEAD. AFTER GND CTL TOLD US TO CUT OUR PWR; OTHER ACR FLT SAID WE ALMOST BLEW SOME OF THEIR PAX OFF OF THE BOARDING STAIRS. I THEN MOTIONED FOR THE TAXI GUIDE TO HOOK UP HER HEADSET AND ASKED HER FOR A TOW. WE WERE TOWED SEVERAL YARDS AHEAD AND CONTINUED AN UNEVENTFUL FLT. THE WX WAS 3000 FT SCATTERED; 68 DEGS F AND WIND 230/6. THE RAMP WAS DRY AND OUR WT WAS 153;818 POUNDS. I WAS AWARE OF THE MIN PWR REQUIREMENT ON THE GDL RAMP; BUT I FELT 60% N1 WAS NOT EXCESSIVE PWR TO 'UNSTICK' THE ACFT. IN RETROSPECT; I SHOULD HAVE REQUIRED HEADSET COM WITH THE RAMP PERSONNEL FOR START AND TAXI INSTEAD OF ACCEPTING HAND SIGNALS. WE WERE 20 MINS LATE 'OFF THE BLOCKS' SO AT LEAST 25 MINS HAD PASSED SINCE THE LAST LOOK BEHIND OUR ACFT BY A COCKPIT CREW MEMBER AND I SHOULD HAVE VERBALLY ASCERTAINED THAT THE AREA WAS CLR OF PERSONNEL BEFORE ADDING PWR TO TAXI. I ALSO FEEL OUR RAMP PERSONNEL ARE INADEQUATELY TRAINED AT GDL. THE TAXI DIRECTOR SHOULD NOT HAVE MOTIONED ME TO COME AHEAD WITH PEOPLE BEHIND ME; KNOWING THAT I WOULD HAVE TO ADD PWR TO TAXI. THIS MAY BE AN INHERENT PROBLEM AT GDL BECAUSE OF ITS 5000 FT ELEVATION AND RAMP CONSTRUCTION. EVEN AFTER WE WERE TOWED FORWARD AND OUT OF THE OVERNIGHT 'RAMP RUT' AND TIRE FLAT SPOT; IT STILL TOOK 50-55% N1 TO GET THE ACFT ROLLING.