I'd start with a compression and leak down test. You can do these manually on an engine stand. Use a battery to jump the starter motor.
For example....
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1999 996 C2 - sold - bought back - sold for more
1997 Spec Boxster BSR #254
1979 911 SC
POC Licensed DE/TT Instructor
Last edited by thstone; 10-24-2018 at 10:21 AM.
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