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  1. 1

    HELP: Why am I having a hard time passing emissions

    1991 Explorer 4.0 Ever since I've had this truck (8-9 years) I've always had a hard time passing emissions. I live in TN near Nashville we have to do emissions for the counties that touch Nashville. So not all people in TN might not know this. For me they do a tail pipe probe. Every year...
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