I emailed Permatune to inquire if they had an answer to this issue and this is the response I received. Has anyone tried the method described. It appears that Permatune is side stepping the fact that thier unit may have issues - it is a grounding issue.
"Sounds like an ongoing ground loop problem. I have seen this many times
where the mechanic overlooks the simplest things. In one case, a car had
been to the top 4 Porsche mechanics in the city and finally came to us
in a last ditch effort. I found a bad battery ground wire using our
trouble shooting guide in about 30 seconds. The car has run perfectly
ever since. I know of at least five cases where a Porsche was purchased
at fire sale price due to ongoing ignition problems that the new owner
fixed with a $2.00 ground strap after contacting us.
Below is a link to the trouble shooting guide for the 911SC. Perform the
ground circuit check exactly as it appears in the guide, do not skip
sections and perform the operations in the order given.
http://www.perma-tune.com/T-ignition-Porsche-911SC.html
If you want to send us the unit to check it out, let me know before you
ship it.
Best regards,
Lonnie"
Thanks for the suggestions, I have spent a couple of hours gleaning the information on this site regarding the "permajunk/permadoom/permaturd/ect" and it now my understanding that I shoud look at using it as a wheel chauk or paper weight. BTW - I have the silver unit not the blue.
Bret