aerostar missise

hi all ford people
i have a aerostar 1993 eddie bauer 4l 4x4 , and when i am runnig with , it is having misses , like if the gaz or tranny is not constant , i have change
the gaz filter , and did a tune up , and it is still doing it i have even clean the injector , so now i am at a stop any of you has any good thing to try for me ,
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