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Q:

engine misfire at speeds between 45 and 55,fluctuating rpms on 2001 Chevrolet Blazer

Rookie cbe0621eac06868b3efe0d8d1d3611e23c60d3114864ea2ec19a68cfbd3eebab
truck runs fine except between this speed
(1) Answer
Do you have any check engine codes? If so, get read and post. It sounds like either a misfire condition or or an intake/exhaust flow issue. Need to get comp. read to see if any codes are present.