to dmorrison and others
Changed oil immediately to 20W-50 Castrol, considering the 90-degree heat and 100% humidity here (S. F;lorida).
In adition, pullked just a couple of plugs today and can report cpondition:
Bosch W8DC's. No residue anywhere. Tips and gaps still good. Tips and electrodes are kind of bleach white in color - from heat, I suppose. But no wear evident or reside.
what do you think now? Still an air/mix issue, i.e., the 'fluttering' on moderate-heavier acceleration?