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what cause my 99 chevy to idle low and shutoff while driving

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99 chevy astro idle low and shut off while driving

Vehicle: 99 Chevrolet astro 3.4

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The cause can be 2 item a IAC (idle air control valve) or a partial open EGR. An EGR stays partially stay open when you come to a stop the engine stalls, As for the IAC it just the same symtom

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