DURING GAR CAUSED BY WINDSHEAR; FLC OVERSHOT ALT ASSIGNMENT. DISTRS OCCURRING DURING THE GAR CONTRIBUTED TO THE ALTDEV. SOME WERE: FLASHING EPR GAUGES; QUICK ARR AT ASSIGNED ALT AND MULTIPLE ACFT DISCREPANCIES.

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ON A MISSED APCH DUE TO SEVERE WINDSHEAR AT DFW; WE WERE GIVEN A 3000 FT ASSIGNED ALT. WE HAD ENCOUNTERED A VERY SUDDEN 20 KT INCREASE IN AIRSPD ALONG WITH GOING 2 DOTS HIGH ON THE GS FROM WHAT HAD BEEN A PERFECTLY STABILIZED APCH AT 500-800 FT. I ASKED MY FO TO RPT IT RIGHT AWAY RATHER THAN WAIT UNTIL WE HAD COMPLETED OUR MISSED PROC BECAUSE THERE WAS A GREAT DEAL OF CLOSELY SPACED PAX TFC BEHIND AND BESIDE US. NOTABLY; THE ONLY CLUE TO THIS SHEAR HAD BEEN SOME VIRGA IN THE AREA BUT NOT OVER THE FIELD. DURING OUR GAR; WE NOTICED THAT ALL 3 EPR GAUGES WERE FLASHING. WE PULLED BACK THE THROTTLES WITH NO HELP; HOWEVER; ALL OTHER ENG INDICATIONS WERE NORMAL. 3000 FT CAME QUICKLY; AS WE WERE FERRYING THIS ACFT; EMPTY; FROM MAINT WHERE; I'M TOLD; OVER 100 ITEMS HAD BEEN FOUND WRONG WITH IT BY MGMNT 'ACCEPTANCE PLTS.' TRYING TO TROUBLESHOOT THIS UNIQUE PROB ALONG WITH FLYING A MISSED APCH; MAKING THE WINDSHEAR RPT; AND BEING SWITCHED TO DEP HAD US BUSY AS A CREW; NOT TO MENTION THAT WE WERE GIVEN CLOSE TFC TO FOLLOW AND/OR AVOID (3 OF THEM) WHICH HAD ME OUT OF THE COCKPIT VISUALLY. I DID NOT ENGAGE THE AUTOPLT; WHICH WOULD HAVE HELPED; AND SO ALLOWED MY ALT TO CREEP UP TO 3300 FT BEFORE RECOVERING IT. THIS CAUSED NO CONFLICT THAT I KNOW OF. IN FACT; I THINK I SUBCONSCIOUSLY HEDGED UP BECAUSE I WAS EXPECTING HIGHER; WHICH THEY DID GIVE US RIGHT AFTER THIS. THIS EVENT WAS A REMINDER TO ME OF HOW BUSY I CAN GET DURING UNUSUAL SITS AND HOW VULNERABLE OUR SAFETY MARGIN CAN BE UNLESS I USE ALL EQUIP AVAILABLE TO ME; CONCENTRATE ON FLYING FIRST; AND EVEN WITH VERY NEW AND INEXPERIENCED CREW MEMBERS; TO COUNT ON THEM TO DO THEIR JOBS; BECAUSE I CAN'T DO IT ALL. THE EPR GAUGES TURNED OUT TO BE MISWIRED AND I'M NOT SURE WHY THEY APPEARED TO WORK UNTIL OUR GAR. ALSO OF NOTE; NONE OF THE OTHER ACFT APCHING DFW WENT AROUND OR RPTED WINDSHEAR THOUGH THERE WAS STILL UNMISTAKABLY RPTABLE SHEAR ON FINAL WHEN WE WERE SEQUENCED BACK IN.