what and were is the MAF sensor

tying to find the MAF sensor on a 94 chevy- S10 blazer - 4.3L cpi vortec motor, and how to change the sensor

MAF is Mass Air Flow Sensor, and it should be somewhere along the intake tube, past the air filter

Good news , you don't have one on a 94 model . They started using them on mid 95 for the 96 OBD2 systems . But if you had one , it would be on the air intake duct just before where the accellerator cable is connected to the throttle body( butterfly plate) . Rob