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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.

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