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International Automotive Technicians Network
Prev Professional Automotive Repair Technical Discussions for May 23, 2026
International Automotive Technicians' Network (iATN) - Members Only
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(Also Available: All, Asian, Chrysler, European, Ford, GM.)
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2020 Mazda CX-9 Signature 2.5L Poor Idle Quality, Misfire VIN: JM3TCBEY1L
came from another shop mass air flow was not reading egr was sticking. replaced mass air removed egr and cleaned. just unplugged for time being pricey little fellow. Now runs good off idle ,soon as sets and idles for a couple of minutes starts back missing... Trouble codes: P0300
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