Chevrolet 1999 Tahoe Owner's Manual page 383

Long Trip/Highway Scheduled Maintenance -- Gasoline Engines
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Inspect engine accessory drive belt.
An Emission Control Service.
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Replace fuel filter.
An Emission Control Service. (See footnote
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Inspect fuel tank, cap and lines for damage or leaks. Inspect fuel cap gasket
for any damage. Replace parts as needed.
An Emission Control Service. (See footnote
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Inspect Exhaust Gas Recirculation (EGR) system as described in the
service manual.
An Emission Control Service. (See footnote
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Inspect Evaporative Control System. Check all fuel and vapor lines and hoses
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for proper hook up, routing and condition. Check that the purge valve works
properly, if equipped. Replace as needed.
An Emission Control Service. (See footnote
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