Has this sluggishness just started or have you been dealing with it for a while, both before and after mods?
With the exception of VSS all items replaced seem routine considering your mileage.
Don't think EGR would be problem when no CEL.
p.s. v6?
98 Mystique LS v6 atx 110,000km
97 Contour LX v6 atx 125,000km
stock CD on LS, cass on LX
spoiler, tinted windows on LS only
4 wheel discs on LX only
All other available options on both
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