Pontiac 2002 Firebird Owner's Manual page 335

Scheduled Maintenance
100,000 Miles (166 000 km)
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Inspect spark plug wires.
An Emission Control Service.
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Replace spark plugs.
An Emission Control Service.
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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. Manual transmission fluid doesn't
require change.
150,000 Miles (240 000 km)
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Drain, flush and refill cooling system (or every 60 months since last
service, whichever occurs first). See "Engine Coolant" in the Index
for what to use. Inspect hoses. Clean radiator, condenser, pressure cap
and neck. Pressure test the cooling system and pressure cap.
An Emission Control Service.
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