I pulled all six old bosch plugs out today...wow...they were really worn out...the gaps was like .070 on all six plugs...but burn color & wear looked normal and even across all cylinders...

So I went and got me six champion (regular-copper) plugs, gaped them at .032 each, installed them...

started up the old girl, and BINGO, no more misfires...all is well again

thanks again for your help guys!