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Thanks Fred - it could be a coincidence I guess, but the evidence is pretty strong....will let you know
Similar thing happened to my 928 not long ago- knew immediately what the problem was and fixed it. No problem with the idle whatsoever thus why I doubt that is your issue.
Whenever I hear of a problem with either hot idle or cold starts I immediately suspect the temp2 sensor. Suggest you check the resistance values to earth at the computer plugs with a warm engine for both the LH and the EZK channels- you should read 100 to 200 ohms- no more.