About to do my 105k tune up. What are the best spark plugs to use?

 

Search my friend....use the search feature. This dead horse has been beaten so much it doesn't even look like a horse anymore.

 

NGK Iridium IX

 

where are the best places to purchase these

 

kragen or similar type store. Use the phone - they either carry NGK or they dont.
Read Seafoamed DIY, and perform intake vac line method 2 days before plug change.

 

They should be $7/each?

 

 

just under 7 bucks each is correct 45 full set with tax
I know I freaked when that was a first mod to the TL, but they pay for themselves in performance and gas mileage
Run a can of seafoam -also 7 bucks- thru the intake manifold vac line a few days before the service to clean the injectors-valves and piston tops- and then replace the plugs