While driving my durango the rpm lunge, what could be causing this?

Question

I will be going at any rate of sped and the rpm will lunge up and hang there for a few seconnds then return to normal, this continues during the ride.

Answer 1

you dont say what year the the truck is. earlyer modles hah issues wich internal vaccume leaks in the inke manifold. also i have seen some issues with the Idle contlroll valve but if that was the case it should only effect what the car does at idle.

Answer 2

Probably your A/C compressor kicking off / on as the ambient temperature maintains a steady setting... The compressor takes a good amount of engine power so there exist electronic actuators that automatically compensate for this by giving it a little more fuel when it kicks on, then reducing the fuel some when it kicks back off. This would affect your rpm's a little bit, more so on an automatic, you would see it on the needle indicator, and it is completely normal.
To confirm this, pay careful attention as you drive, you might even hear a slight 'click' when it does it (from the compressor's electro-magnetic clutch 'kicking' it sounds almost like a light switch clicking on / off but it's under the hood so it can be hard to hear) but also there might be other ways you can tell this is going on, such as idling with the hood open and watching this fascinating throttle / compressor related behavior happening.

Answer 3

Sounds like the torque converter clutch is unlocking and then locking back in on you. That could happen when you step on gas or release pedal and step back on it. It may be normal if you're one of those nervous drivers that can't keep or hold a speed.

Answer 4

tammy u have a problem with your cruise control system// or a sensor has went bad// take ur durango to an ase certified shop and have them put it on computer and find out whats going on// or if its a mechanical problem// god bless //goodluck

Answer 5

Sounds like throttle position sensor bad.

Answer 6

try a fuel filter