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FinalGear, Thanks for the input. I do most of those things on a regular basis. I bought new ignition coils and NGKs last week, but I hadn't thought about the PCV or thermostat, though. I'll pick those up today. The brakes and tires are better than OEM--that's kind of a no-brainer on a car...

My wife's 2005 Corolla has 140k and the engine sometimes vibrates (more here recently) and the gas mileage is a little bit less than it should be. I've never replaced the ignition coils on it. I replace the spark plugs every few years because she doesn't put many miles on the car, so I'm going...