ii thinking...maf sensor, or vacuum leak?
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2000 Volvo S70 Question: po code 174, 304, and 304
Answer #1Bertini's German Motors of Roseville (14 Answers) , Roseville, CA - (916) 288-9535Bertinis July 01, 2013, 16:17Enthusiast
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