Originally Posted by
petrified.rabbit
well i know i can feel some hesitation when i am due for an oil change, and the car feels peppier afterward. The aveo is the only car i have ever felt that in though. I still most often change my oil on moths and mileage, but sometimes I do it earlier because of how it is driving. You need to be changing your oil. Period.
The next thing to do is start the car, and then mist the wires and coil pack with water, if the need replaced, they will arc, or the car will sputter, this is fun to do in the dark because if they are bad it can be like watching fire works. I usually start at the furthest plug from the coil pack, and then work towards, this helps distinguish if its wires or the coil pack. Don't touch them until the cars turned off.
Change your plugs.
If that doesn't fix it, you will be cleaning the throttle body, it probably needs done anyhow because of haven't changed your oil in 20k miles. The oil breather goes into the intake, its the "dirty" oil that runs up the passage and gums up the throttle body.
Odds of bad gas are slim as a prolonged problem unless you get the same gas from the same station everytime, and they havent gotten new gas to cycle out their bad gas, etc..
If your 20k over do on your timing belt, change it or youll have a lawn ornament and tell everyone aveos suck when it was your negligence that killed the car.