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1993 Ford F-150

Question: what is causing my truck to idle so high?

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yardratt2007, 4.9L 6 Cylinder, Pawtucket, RI, January 31, 2012, 07:15
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It idles down initially after startup but then after driving idles up high in neutral. All new cap rotor plugs and wires, new IAC valve, some new vacuum lines. Could it be TPS?

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