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po code 174, 304, and 304 on 2000 Volvo S70

ii thinking...maf sensor, or vacuum leak?

Asked by for the 2000 Volvo S70
If it is a fault code for a lean condition and misfire I would recommend:
Smoke test the intake system for leaks, repair any leaks.
If fault returns it could possibly have a faulty Mass Air Flow Meter
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