Chevrolet 1998 Tracker Owner's Manual page 333

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Short Trip/City Maintenance Schedule
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100,000 Miles (166 000 km)
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If you haven't used your vehicle under severe service conditions listed
previously and, therefore, haven't changed your automatic transmission
fluid, change both the fluid and filter.
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Replace Positive Crankcase Ventilation (PCV) valve. Replace any worn,
plugged or collapsed hoses.
An Emission Control Service.
An Emission Control Service.
An Emission Control Sewice.
An Emission Control Service.
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Inspect Exhaust Gas Recirculation (EGR) system.
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Inspect fuel injector.
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Replace evaporative emissions canister.
DATE
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7-30