Pulled the plugs to take a look before work yesterday, and found Champions in there. Bought 4 NGKs and the idle seems smoother, and the throttle response seems better as well. I'll Seafoam it and change the oil in the next few days. Got a quote of $600 for parts & labor on a timing belt change, including the accessory belt, tensioner, pulley, and thermostat. Does that sound reasonable?
Mark
Mark