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GMC
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1988
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Forward Control 4.8 T, Standard
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Repair and Diagnosis
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Engine Performance
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Adjustment
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Tune-Up - V6
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Service Intervals
Service Intervals
REPLACEMENT INTERVALS
Component
Interval (Miles)
Air Filter
30,000
Fuel Filter
30,000
Oil & Filter
Normal Use
7500
Heavy Use
3000
PCV Valve & Filter
(1)
60,000
Spark Plugs
30,000
(1)
Inspection only, replace if worn.