UNEVEN IDLE SPEED ON 124.032

ON 1993 124.032 WITH 104.992 ENGINE IDLE SPEED UNEVEN IN PARK GEAR(JUMPS UP & DOWN FROM 500 RPM TO 1100 RPM).
THE IDLE SPEED ACTUATOR HAS BEEN REPLACE.( 000-141-57-25 )AND IDLE SPEED STILL SHOW UNEVEN (GOT A LOT BATTER THEN BEFOR WITHOUT A/C,(WITH A/C ON UNEVEN IDLE SHOWS AGAIN)ALSO ENGINE HAS MISS FIRE AT TIME.
I CHECKED DTC READ OUT FROM (X11/4) WITHOUT
IMPULSE COUNTER.(MY COUNTER WAS SHORT OUT BY
ACCIDENT) SHOW CODE #10,17,21.
AND I ALSO TESTED ALL 3 CODE CAN'T FIND ANYTHING
WRON WITH IT.(MYBE I MISS SOMETHING??)
VEHICLE HAS 84,000 MILE
NEED HELP ! PLEASE.