rpm's stay up

2004 DODGE RAM
100,000 MILES • 5.7L • V8 • 2WD • AUTOMATIC
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BRAD423
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There is no check engine light. When releasing the gas pedal the rpm's stay up at or around 2 gradually go down. I've replaced crank sensor, knock sensor and plugs. It was stalling that went away, but couple weeks later this problem came along. please help
Feb 23, 2019 at 7:51 AM
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STRAILER
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Hello,

I would service the throttle bore first. Here is a guide to help we should also run the codes even though there is no light:

https://www.2carpros.com/articles/throttle-actuator-service

and

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

Please run down these guides and report back.
Feb 25, 2019 at 12:09 PM
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BRAD423
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I cleaned throttle body at the same time I replaced sensors. it is lacking power on take off.
Feb 28, 2019 at 9:25 AM
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STRAILER
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Lets check for vacuum leaks. also please remove the MAP sensor to see if it holds vacuum. And did you run the codes?

https://www.2carpros.com/articles/how-to-use-an-engine-vacuum-gauge

Check out the diagrams (below). Please let us know what you find.
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Feb 28, 2019 at 12:08 PM
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BRAD423
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No vacuum leaks.
Mar 1, 2019 at 3:59 PM
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BRAD423
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Yes no codes appeared.
Mar 1, 2019 at 3:59 PM
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STRAILER
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Does the MAP sensor hold vacuum? I would try replacing the sensor I have seen them cause high idle. If that does not work I would replace the PCM with a rebuilt or used unit. here is the location. If you get a rebuilt one give your VIN so it can be programmed. Check out the diagrams (Below). Please let us know what happens.

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Mar 2, 2019 at 11:49 AM