Where are your air and fuel mixture screws on your 1993 Chevrolet cheyenne 1500 cant find them on the carb?

93 Chev Cheyenne is Throttle Body injected and computer controlled. There is no air-fuel mixture screw and no carburater, just the throttle body. If you suspect an air-fuel mixture problem may I suggest that you run a computer diagnostic test. If either the EGR valve or Oxygen sensor are not functioning properly you can have problems that are similar to air-fuel mixture problems of carburated engines. There may also be other situations that cause that problem but you won't know until you run a diagnostic test.