Considering what you have left to check and what's been replaced so far, it's a pretty safe bet that your hesitation issue is somewhere on the fuel end of things. But do check out your MAF and see if it's filthy, it could be that it's dirty enough to cause some issues without throwing a CEL, but I'm betting it's fuel delivery related.
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-O/D
1997 Arctic Silver Boxster, 5-spd
IMSR + RMS
Robbins glass window top
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