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i had a severe occasional misfire on the interstate so i decided to do a tuneup. plugs, cap, rotor and an o2 sensor. now i get the mis at idle. what gives?
Excessive resistance in the plug or coil high voltage wires will do that. It's easy to miss with the spark plug end at the spark plug contact and leave a gap or have the contact at the end of the plug cables slip in the boot and not make good contact at the distributor cap. It's always a good idea to look at the carbon contact in the center of the cap also, ohm check it. I actually had one fall out once.
It's also common to bend old cables the wrong way and break the core. An ohm test usually finds this quick.
I've inadvertently slide many plug wire ends inside the boot when reinstalling and caused an idle miss.
Could be something else, but this is likely the best first place to start looking.
A good trick to chase down an idle miss, is to hook up a timing light to very spark plug cable 1-6 and shine the light on something dark, so it stands out well. You may be able to actually see which cylinder is missing this way and avoid going back through the whole job again.
Random misses are usually the coil to cap cable or sometimes a very weak spark for whatever reason.