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

truck runs fine except between this speed

by in Slatington, PA on January 14, 2013
1 answer
ANSWER by on January 14, 2013
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.