One thing I've learned is that an old 911 can test your patience!
What I've learned recently is that if I start the car dead cold, it will start no problem, and run with a slightly high idle of 1000rpm. During this time, everything is perfect - no smoke from exhaust, no misfiring or vibration, all is good. After 3 minutes, or 3:30, then problems will set in. Idle with drop, pops and misfires, vibrations. So WTF is going on here?
Anyway, now Victoria is in it's FOURTH COVID19 lockdown (due to massive incompetence from Scott Morrison, Greg Hunt, and basically all of Federal government by not managing hotel quarantine or the vaccination rollout) I have a few days to spare. Thought I might as well put in a new starter motor I bought years ago, and also check the Y cable and vacuum lines while I'm in there.