I have an 01 zr2 blazer with random cyl misfire code. Yea i know theres a million threads on it but none have helped. Ive replaced plugs wires cap rotor and coil yet no cigar. Truck runs fine no rough idle no sputtering no nothing fine at all speeds i just can not figure this out. Anyone have any ideas on this one im beyond baffled. Thank you

 

Sounds like it could be a faulty crankshaft position sensor.