For '88 the recommended replacement interval is 30K miles, with a "remove and inspect" at 15K; 30K is typical for a conventional copper core plugs on an engine running unleaded fuel, but on a clean burning engine they could probably run 60K before the electodes are seriously worn.
The recommended gap is .032", which seems a bit narrow, but it will grow with use. Wider gaps generally give a smoother idle.
Duke
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