performance issues for a 2000 chevy malibu?

unknown

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For the past two months, I noticed that 50% of my driving time is good and the other is bad. I changed my oil, battery, and there is nothing leaking or anything like that. I use high octane gas. On the good times I drive, I can get full power in acceleration speed and runs smoothly. On the bad times, it seems to not have the full power and I seem to floor the gas pedal in order for my car to pick up. What does this mean?

I'm an idiot when it comes to cars so I don't know lol.
I forgot to add that I have a new air filter also. =)
 
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