I am the original owner of a 1983 GT convertible with about 95000 miles. It has no modifications other than a new Summit Carb. I drive it about once a month for 10 to 20 miles each time. About 3 months ago it started running rough so I changed the plugs and it ran fine for a while. After a month or so it ran rough again so I inspected the front 4 plugs and they were all full of carbon. One plug had a piece of carbon across the electrode. I wiped the plugs clean and it runs fine again. The plugs are going to get fouled again. Any suggestions? Valve guides?
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