So my 2000 5.9L Durango will bounce rpms while driving or idling. Not all the time and not just when it is cold. I have replaced the plugs, wires, cap, and rotor, and even ran a can of sea foam through the tank. It has gotten a lot better but it still will bounce the rpms every so often. There is no smell of exhaust when I gun it si I don't think the cat converter is the problem. Also no engine light or fault codes. I just like keeping the truck running in top shape so I would like to try and fix it. Also I haven't found any signs of a vacuum leak, no shops were able to either.

Any ideas and suggestions?

 

replace the TPS, this is a classic symptom of the sensor going bad if you do a search you will see that this is true.

 

+1 replace it and reset the pcm and you should be golden.

 

Like shrp said, replace the TPS (Throttle Position Sensor), it is located on the driver side of your throttle body, it is black in color and has two T25 screws holding it on. Replace this sensor and reset your PCM (see instructions below) and call it a day.

 

I'll give it a try and thanks for the help all