At lower speeds (30-40mph), the rpm's fluctuate about 200 rpm's up and down at steady pedal pressure and speed, but goes away when you let off the pedal or accelerate (or at higher speeds). What's going on here? Throttle position sensor (or some electronic sensor), or the infamous torque converter? Still have warranty with the used car dealer I bought it from.

SOURCE: TRANSMISSION/TACHOMETER

On the top of the motor there is a sensor just behind the oil fill cap. This sensor controls the tach and the trans shift points and torque converter lockup. If it is not working it will burn up the torque converter and trans.

SOURCE: Acceleration issue

Just a suggestion, but the EGR valve can cause that problem. If that checks ok, then I would have the catalytic converter checked for clogging. Both ideas would cause that specific problem. I sincerely hope that this can solve the problem, or at least head you in the right direction. Best wishes.

SOURCE: 2005 Saturn Vue AWD 67,000miles.

change fluid at 50,000mi.

SOURCE: 2006 HSE RR....engine pulsates slightly when light acceleration

1. Fuel Pump pressure too low
2. Dirty air or fuel filter
3. Plug wires running parallel for more than 6" )cross em over each other or you get crossfire)
4. Crack in Intake manifold or split end on one of your vacuum lines or vacuum cap plugs

Check 'em out and let me know!

SOURCE: Car jerks while driving at steady speeds

Did you have the wires replaced also?? If not I would replace both the plugs & the wires all at the same time.You may have carbon tracking on your wires & plugs.What Year is Saturn?? If it's a 91-94 You most likely have a EGR Valve floating due to a weak internal spring.It will cause a surge miss at constant throttle.Hope This Helps!!