Hi, my kia rio will randomly just over rev to 6 rpms

Question edited for clarity.
Question moved to model category

It appears to be a known issue with them

https://www.google.com/search?q=2007+Kia+Rio+base+model%2C+5+speed+manual+transmission.+The+clutch+pedal+stuck+on+the+floor

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vacuum leak

MANUAL TRANSMISSION, CLUTCH SLIPPING
AUTO TRANS. CHECK FLUID, IF LOW ADD
CORRECT TYPE OF FLUID, IF BURNT SMELL
HAVE DEALER CHECK

you don't say whether it's diesel or petrol, If diesel it has a vacuum pump to give pedal assistance, these have a valve in the pump that can cause such a problem, if however it's petrol I would suspect a master cylinder fault. Regards Mike

Could be TPS sensor.[RPM].

Have you checked the fluid level?Was there any oil leak spots under the car?
Correct any low fluid level and give it a try.
If the fluid is at the correct level,disconnect the battery for 10 mins then reconnect and try it again,if it still won't work you may have to have a transmission expert take a look at it.
You can put in a used transmission if needed and not spend lots of $$$ for a rebuilt trans,or just buy another complete vehicle to drive and not fix your 2002.

its because or engine rpm is below 800 when u remove your foot from the gas pedal, try adjusting your engine rpm to 800 or above to get a smoother idle speed

yep,that right,3500 = 70 mph.in5th gear. small engine/high revs.

not normal at all,a couple of causes 1 small valve at the front of the servo unit,2busted pipe coming from the servo unit,3the servo unit itself needs replaced.so where is the servo unit?.if you lift the hood you will see in front of the brake pedal only inside the engine compartment look closely and try to judge it ,its about the size of a bottom of a small sauspan only about 4/5 times the thicknes,thats your servo and that where your problem is.adrian,,,

If this an automatic replace your throttle cable located in the same place with that of the accelerator cable. Keep me posted.