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When you say sluggish is it misfiring, or just slow to rev yet smooth?
Check your battery terminals. make sure they are free of corrosion. Something very simple to do and a surprising culprit. An mx-6 i used to drive would misfire constantly only after heating up. It was due to very bad terminal connections (the battery terminal literally melted due to such high resistance).
Of course pull codes (get cheap OBDII from auto parts store).
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