Originally Posted by stevo0525GT
Actually every one but cylinder 3
If all except #3 I would start to look at the injector for #3 - it may be the real culprit. If that injector gives a lot more fuel than the others then the car will lean out the other cylinders causing them to misfire since the O2 sensor won't know that one cylinder is rich and the others are lean.
If you look at the spark plugs - are they identical or is one of them having a different look?