2003 Lexus LS430 Q&A

2003 Lexus LS430 Question: what to due as part of a tune up

I keep up with oil and tires, did fuel injector cleaner 4 months ago, but haven't done a tune up in a while, what should I consider in the tune up, spark plugs, another fuel injection clean? raidiator flush? what else? trying to avoid unnecassary expense. -
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