Problem Solved!
Greetings Jimmy & Jaison,
A big thank YOU to both of you for all your suggestions.
Flatratetech.com is a great web site.
Plugs were in '91 GM for about 20K from 120-140K miles...I didn't think they needed to be changed. Plugs 1 to 7 looked great, but #8 had a big glob of carbon shorting out the electrodes. I showed fouled plug to a Master Tech. and he felt it may have been just a piece of carbon that got lodged in #8. Oil conslumption is not excessive...about a quart to 2K-2.5K miles. Check of #8 ignition wire seemed to be OK @ 10K ohms total. My wife is primary driver and she takes 3 or 4 trips each week for a distace of only 2 block .... and this may have been part of the problem. I'll try to post a photo showing a typical good plug along side of the fouled #8 plug.
Case Closed! Got to start working on slight hesitation in slant 6 in '68 Dart.
Thanks again. Take care.
Art G.
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