Unstable/High Idle
Posted by sdp
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You can reset the computer to factory defaults by disconnecting the battery for 5 to 10 minutes.
Then you may have to wait while the ECU relearns the engine and your driving style. The ECU usually normalizes after several restarts so waiting isn't that big a deal. I wouldn't bother with any of this until the new bellows has been installed; duct tape does a good job but there will still be small leaks. The spark plug hole may have to have a helicoil put in because once the plug threads are damaged and any attempts to clean them are done, the factory fit will never be achieved. Even the helicoil approach isn't a guaranteed fix if it isn't done properly. Much simpler to just check the plug every couple of weeks when you check the oil 
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Funny thing, I just went through this on another vehicle I just bought (I knew it had this problem when I bought it). PO had messed up the threads on all of the cylinders by putting the wrong ones in. A buddy of mine (who I bought it through) had cleaned up all of the cylinders but one. One of them was just too bad and when he put the plug back in, the engine blew it out a short time later. I was able to helicoil that and it runs great now. BTW, you can helicoil it yourself pretty easily. You might even be able to do it without taking the head off.
On a brighter note, a friend of mine with an e30 had one fall out one time too. Actually, I think it was the #6 as well. Anyway, it just hadn't been tightened up properly by the shop he had working on it I guess. He put it back in and tightened it up and never had another problem! Did you take a good look at the plug? The one that blew out of mine was all banged up from hitting something when it came flying out, so make sure it is ok and that the gap is set correctly. I would just tighten it up to spec and check it once a week or so. If you don't notice any change after a couple weeks I would say you are probably just fine.
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