With all the parts you are throwing at it, it might not be a bad idea to have a shop spend an hour or 2 doing a diagnostic on it so you can replace only what is necessary to fix the issue. Been down this route with other cars. Sometimes it is a good idea to take a step back and have another set of eyes on an issue vs replacing parts that may not even be the issue.
I suspect you have a vacuum leak and/or an issue with a ground wire or wiring issue somewhere
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2000 Boxster Tiptronic
2003 Boxster
2003 996 C2 Cab
2002 996 (SOLD)
1986 944 (gone but missed)
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