pickup surges when I shift from fourth to fifth gear

SOUNDS LIKE POSSIBLEY A VACUME LEAK AT LOW IDLE, IF IT HAS AN IAC CONTORL VALVE TAKE IT OUT AND SEE IF ITS MOVING FREELY, AND THE PASSEGES ARE CLEAN, OR A VACUME HOSE IS CRACKED SOME WHERE OR THE INTAKE GASKET IS LEAKING. CK FOR IT BY SPRAYING CARB CLEANER ALONG THE GASKET AT THE MANIFOD TO THE HEAD AND LISTEN FOR A CHANGE IN THE IDLE. OR A FUEL DELIVERY PROBLEM,BAD REGULATOR OR FUEL PUMP, CK PUMP PRESSURE,FUEL FILTER PLUGED UP, MAP SENSOR NOT WORKING PROPERLY,WORN DISTRIBUTOR DRIVE.