Correct spark plug?

[PeterBergin at aol.com]

Thanks for the response guys, I found a source for the correct plug in town 
(Minneapolis) for about $14.  I will get a set tomorrow.  My car has developed 
a miss (slight bucking) at midrange, that mostly disappears after a 30 minute 
drive.  Last time I had a similar problem it was cracked porcelain on a plug.  
There are about 65k on the current set (correct plug).  My only other concern 
is that I have 195k on the original wires.  I did replace the cap and 
"correct" rotor about 50k ago.

Thanks again
Pete
91 Avant
(Thinking about an All Road)