air injection plugs
 

So here I was Sat. morning following a guy going about 45mph on a 55mph
road for about 6 miles, and I was in a hurry. Finally got to a section
where I could pass him with no oncoming traffic. Downshift from 5 to 4
and power by him, get just about past him and all of a sudden my motor
got really loud, almost like the muffler came off, but only from one
cylinder. (actually sounded more like an old John Deere tractor)
Figured well I still have power, will go ahead and finish the 2 mile
trip to my brother-in laws house. Got there the Jeep still loud and
kind of popping. Popped the hood and found I had blown out one of the
brass plugs that were inserted into the exhaust manifold when the air
injection stuff was removed. The thing is about half of the threads on
the plug are missing, assuming they are still in the head. So it looks
like I need to tap the hole to clean the threads and put a new plug in.

Where can I get one of these plugs?

Should I worry about the 2 miles and then 10 miles I drove home with the
plug removed?

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