Thank you General Motors
It's about impossible to know what size I need if I can't even get one in there. I need to know what the size is beforehand so I can buy one at the local auto store. At least I now know it's a tamper proof bit. Thanks GM. Maybe I should just leave it alone. Changing the part will probably not make any difference in performance anyway. And by performance I mean normal running. It's embarrassing to be so slow.
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