I changed the EGR sensor recently and the vehicle performance improve, but the check engine light turned on again. should I check the O ring in the intake manifold or just ignore the light? When I turn on the vehicle in the morning it accelerate and decelerates for a second, but then idles good. The codes are P0171 P0325 P1000 P174.
 
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Ask Your Question1999 Ford Explorer
Question: what would the best book to purchase as a repiar guide on this vehicle?
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