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Sluggish Engine Response

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Hello everyone. I have a '99 ES300 with 165k miles on it. Still runs great but as the years go by I'm getting slower and slower. I have replaced the spark plugs and the Mass Air Flow Sensor. I change the oil every 3k miles with high mileage oil and filter. But I'm wondering what other things I can do to tune her up and make her respond a little better. I know I'll never have the engine of a new car again, but anything you can offer that would help her purr a little better would be appreciated.

I have noticed that it gets worse in warmer weather if that helps you offer any other advice.

Thanks everyone!

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