My 2009 Chevy Aveo is having acceleration hesitation issues. I just swapped out the old plugs for new oem plugs. Two days ago I changed the ignition coil pack and the 02 sensor.

SOURCE: hesitation acceleration

have you checked the fuel injector? if enough fuel is not getting through when accelerating it could "choke" causing the hesitation

SOURCE: hesitation during acceleration

could be the type of plug you are using.I was told only to use ngk plugs.I recently put bosch plugs in my mazda 3 and the check engine light came on and it started missfiring.

SOURCE: engine hesitating during acceleration

Ok, there are many issues here that you will need to inspect. I recommend changing the fuel filter and pump as well. this will fix the hesitation. the intake and exhaust manifold gaskets will need to be replaced as well. this will stop the backfiring.

I also recommend checking and running a teat on the PCV valve and inspect the PCV hose as well. it could have a leak or a small crack on it.

Check the air filter and change if needed. this will help with acceleration issues as well. Next, i would run a check on all plugs and the complete wire set as well. change if needed.

Inspect the injectors for leaks and lose wires. make sure they are in good condition. replace any injectors that isn't firing properly.

Ok, there are some sensors that you will need to check as well. i will list them below.

SENSOR CHECK LIST--

1. Check the O2 sensors for worn wires.
2. Check the MAFS(Mas Air Flow Sensors) Check for Damaged, Loose, or Faulty Mass Air Flow Sensor or Circuit.
3. Check the Air Cleaner Temperature Sensor. this sensor could be damaged ro have loose wires. check accordingly.
4. Check the Throttle Position Sensor. this device could be connected wrong or it may be faulty as well. replace if needed.

Be sure and inspect all the above and repair any problem spot you ruin across during your inspection.

Please rate and god bless:)

SOURCE: 1989 Cavalier Z24 3.1 rough idle and hesitation

I had the same problem with my Z when i had it. But it worked when i just left the little hose off of the EGR valve.

SOURCE: Poor performance, hesitation, sluggish and shaking

Those are cylinder misfire codes. PO300 is random misfires (meaning 1+ cylinders misfired) and the other 2 codes are for cylinder #1 and 2. Did you change the ignition coils yet on 1 and 2?

Do you let the tank go to empty before refueling a lot?