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

truck runs fine except between this speed

Asked by for the 2001 Chevrolet Blazer
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.