ls engine random missfire and sooty plugs on one side

[dsraven]

just had the random misfire code and, when checked, sooty/carbon fouled plugs on one side of the engine. the plugs on the other side were all normal. did some quick fuel pressure tests and flushed the injectors, same problem. swapped out the precat o2 sensor on that side and cleaned the plugs, all good now. gonna run it for a day or 2 and then do a tune up and fix that annoying exhaust leak from broken manifold bolts. can't wait for that drivers side manifold........