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I think it good advice to attempt a reseal of the box and determine reason for backfire.
Is there a trouble shooting process for CIS issues? Backfires?
The engine ran ok except for a miss at 2 k rpms
From the threads sounds like I need to drop the engine again to get to the CIS.
Does it make sense to go with PMOs at this point? Or ?.?.
Do you think the not having an O2 sensor could have caused this?
Would it make sense to see a Porsche shop?
The car is a challenge but a great experience.
Thanks for all your help. This is a great community
Michael
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