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If it is and automatic transmission the idle will be at about 900 RPM and is not recommended to be adjusted but can be adjusted at the trottle position sensor (TPS) located just abouve the air heater intake on the driver side. If the truck is a manual transmission the idle should be in between 700 and 850 RPM and is not recommended to be adjusted but again can be at the TPS.

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12y ago
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Q: How do you adjust the idle on a 1998 Dodge diesel truck?
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