The wires looked good, I picked up some fuel injector cleaner, and I'll check the plugs in several hundred miles to see how they look.

The only other reason I can think of for running lean would be my 2nd extended O2 sensor. Maybe the voltage has dropped slightly as a result. Although I think it would have to be the first sensor having problems anyway, so nevermind.

 

the first o2 monitors how rich/lean you run

the second monitors how well your cat is doing

 

could be a problem of temperature range of the sparkplugs??? maybe colder or hotter???