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Update: I replaced the spark plugs and the car ran like a champ. Now the engine light came back on, and the car rattles during stops or when idle. But when I accelerate it runs smooth. Any ideas on what it could be this time?

Update: I ran the scan. The code read as P0302. Any idea on what this could be? Is it something that is suggested I try to fix on my own? Again, any help would be appreciated.

Backstory: My check engine light came on and my 1999 Corolla would pull and tug when I accelerated. I ran the scan and the code that came up was P0171 for the O2 sensor. I replaced the sensor hoping to solve the problem. After replacement, the car does have a little more power upon...