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  1. Engine Performance/Maintenance Tech
    When I drive in "D" my CEL "check engine light" will come on, but it will not do it if I keep the truck in "4". It is as if I am not getting a high enough RPM to run efficiently and the sensor trip the code "P0430". I can drive all week in town in 4, and the CEL never trips, but it is in town...
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