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08 Navigator idles high

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Old Jun 4, 2022 | 07:47 PM
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rubles
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08 Navigator idles high

I have a 2008 5.4 Lincoln Navigator that Idles around 2000/2100 when in park or neutral.
Its has been sitting for almost 3 years with transmission problems. I finally put a used transmission in and seems to be all good except the high idle. It runs and drives fine down the road and when in gear it idles around 800/900.
Could the used transmission be causing the high idle issue?? No codes come up.
 
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