Not trying to be rude but did you read my entire post, it pretty much answers your questions. The plugs are Autolite 25 in a 6X head but none of that matters since all the other cylinders are firing fine except number 3. Firing order has been checked. All plugs are gapped to .045, as you can see I already did quite a bit of trouble shooting. One thing I did not check is if there was some paint in the spark plug hole but this would be unlikely since the plug has been in and out a few times but it wouldn't hurt to check it.
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Tim Corcoran
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