I have the same problem with my 04 v6 awd vue.
The issue i see is with the transmission torque converter going in and out of lockup consistently. I have noticed when i engage cruise control this problem goes away for the most part. Today i turned on cruise at 30 miles per hour after noticing the rpm fluctuation about 400 rpm. change to only about 100 rpm. This has been an issue scene day one from the dealer. no codes, the transmission has not failed nor the torque converter. I think it is an issue with the drive by wire system. when you engage cruise control the foot throttle position sensor is out of the equation. This is my best guess, you can take it with a grain of salt.
SOURCE: Same Problem, warm air at low RPM's 2006 Saturn Vue
Fan not drawing air through rad.When driving at high speed the air is rushing through the rad and cooling it down.Check the fan is working!!
SOURCE: How to change the manual transmission fluid in 04 SaTURN vUE
take it to a 'jiffy lube' place and pay them to do it.Will probably cost $29.
SOURCE: cars engine rpm revs up periodically or shifts erratically
Sounds like you could have a vaccuum leak. you could spray carb cleaner around your lines and see if the engine's rpm increases or starts running like ****. That would be an easy test to indicate leak or not.
SOURCE: 2004 Saturn VUE A/C weak at low rpm
this is your...man what was that called...it is next to your fire wall..it regulates the high and low side.. any way it is costly and it is a ***** to get to. sorry may have to rev the engine for a while..
Orifice Tube that is what it is called.. man thought i would never forget that.
SOURCE: i have a 2003 saturn vue 2.2 engine 5 speed manual
your clutch needs ajusting
Testimonial: "thank you. i will give that a try and see what happens"
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