C172 PLT HAS CTL PROBS; DECLARES AN EMER AND LANDS.

Narrative

I APCHED WITH FULL FLAPS; CARRYING SOME PWR. OVER THE THRESHOLD; I PULLED THE PWR AND SIMULTANEOUSLY STARTED TO FLARE. THE NOSE DROPPED SHARPLY; AND I IMMEDIATELY APPLIED FULL PWR; BOUNCING ON THE NOSE BACK INTO THE AIR. I TOLD ATC I WAS GOING AROUND. MOMENTS LATER; I REALIZED THAT I HAD THE ELEVATOR AT WHAT SEEMED TO BE THE AFT STOP; BUT WAS NOT CLBING AS STEEPLY AS EXPECTED. I ANNOUNCED TO ATC I HAD A PROB WITH MY CTLS. I INITIALLY DECLINED THE OFFER OF ASSISTANCE; AND PROCEEDED; OUT OF HABIT; TO MAKE R TFC; WHICH HAD BEEN OPPOSITE OF MY MOST RECENT CLRNC. I THEN TOLD THE TWR THAT IT MIGHT BE GOOD TO 'GET THE TRUCKS OUT' AND SUBSEQUENTLY DECLARED AN EMER. I WILL NOTE R TFC WAS ADVANTAGEOUS TO ME DUE TO FEWER OBSTACLES AT LOW ALT ON THAT SIDE OF THE RWY. ATC DID NOT MENTION MY CLRNC DEV. THE NEXT DAY THE MECHS FOUND THAT THE 'SERIALIZER' AND SERIAL CABLE FROM THE INOP GPS HAD FALLEN FROM THE PANEL AND WAS RESTRICTING THE CTL MOVEMENT. THE INOP AVIONICS; WHICH WERE NOT REQUIRED FOR THE FLT; WERE; THUS; THE ROOT CAUSE OF THE SERIOUS CTL MALFUNCTION.