High idle when transmission put into gear

2000 NISSAN FRONTIER
150,000 MILES • 3.3L • 6 CYL • 2WD • MANUAL
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GLYNB356
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Tachometer/engine runs up to 2000 rpm's when I put it in gear. Prior to being in gear has normal curb idle. What is up?
May 4, 2018 at 4:46 PM
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STRAILER
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It sounds like a TPS sensor could be out but to be sure lets run the codes to see what comes up.

https://www.2carpros.com/articles/checking-a-service-engine-soon-or-check-engine-light-on-or-flashing

Please run down this guide and report back.

Cheers, Ken
May 6, 2018 at 4:55 PM
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GLYNB356
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Replaced that already, This is happening when the shifter is put into gear. Educated guess it is a sensor on the gearbox. Really a question of is it?
May 6, 2018 at 7:03 PM
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STRAILER
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I do not think it has anything to do with the transmission. Is the check engine light on? Can we run the codes to see what comes up?
May 7, 2018 at 11:23 AM