MD80 CREW DID NOT REDUCE ENG PWR TO CLB THRUST AFTER TKOF AT MMMX.

Narrative

DEPARTING MEX; FO FLYING. AS WE REACHED FLAP RETRACT SPD; FO CALLED FOR FLAPS UP. JUST AS I MOVED THE HANDLE TO THE UP POS; THE ACFT SPD STAGNATED AND DID NOT INCREASE. I DID NOT HEAR THE FO CALL FOR CLB PWR; BECAUSE I WAS FOCUSED ON AVOIDING ANY FURTHER LOSS OF AIRSPD BY A THRUST REDUCTION. IN THE MINS THAT FOLLOWED; WE WERE CLRED OF THE 15000 FT RESTR. I REPLIED; AND WE CONTINUED A VERY SLOW CLB. FOR SOME REASON THAT I SIMPLY CANNOT EXPLAIN; I DID NOT SELECT CLB PWR ON THE THRUST INDICATOR COMPUTER. I DID NOTE NONE OF THE ENG PARAMETERS WERE BEING EXCEEDED. N1; N2; AND EGT INDICATIONS WERE ALL BELOW THE YELLOW AND AMBER ARCS AND RADIALS. ABOUT 10 MINS AFTER APPLICATION OF MAX PWR FOR TKOF; I REALIZED WE WERE STILL INTO MODE ON THE THRUST INDICATOR COMPUTER. IT DID NOT HELP HAVING THE SUN SHINING ON THE THRUST INDICATOR COMPUTER; DIFFUSING THE PWR SETTING SELECTED. WE ALSO HAD A STUCK MIKE SIT; WHICH HELPED DISTR MY ATTN. ONCE THE DISCREPANCY WAS DISCOVERED; I SELECTED CLB PWR. THE FO THOUGHT I HAD SELECTED CLB PWR AFTER THE FLAP RETRACT CALL; BECAUSE HE EXPERIENCED THE TEMPORARY LOSS OF PERFORMANCE ON THE CLB. THIS WAS; AFTER ALL; MEXICO CITY -- A WARM DAY AND A FAIRLY HVY ACFT. JUST ANOTHER NOT TOO SUBTLE REMINDER NOT ONLY TO GET BACK TO NORMAL PROCS AFTER AN UNUSUAL EVENT; BUT TO HAVE BOTH CREW MEMBERS VERIFY THE GAUGES AT ALL TIMES WITH AN OCCASIONAL XCHK. I KNOW I WILL BE MUCH MORE VIGILANT IN THE FUTURE.