02 chevy saburban 5.3L 4wd 220,000miles
# 6 cylinder misfiring.

changed all 8 plugs. (Plugs didn't look bad.) Replaced wires (wires didn't look bad) checked coil pack for resistance with olms good, engine also ran rougher when I unplugged coil pack plug with engine running. Put a auto stesacope to fuel injector and sounds like all the others. Any suggestions gratly appreciated..out of ideas. Thank you

 

Did you get a PO306 code? Can you feel a misfire? If so, with what you've posted, I'd suggest a compression check, could be a burnt valve.

 

P0300 code came up
spacifice #6 misfire
fuel injector
o2 sensor.
another thing I notice is a real strong fuel smell out the tail pipe. No fuel leaks or fuel smell any where else but out pipe. Had auto zone scan vehicle.