Can anyone help me with this

I have an 08 malibu lt my check engine light came
on p0010 i replaced the part went to clear the
code and the check engine light was still on and my
car wanted to start but died right after turning the
key. But after ibwaited like 5 days i went to turn
over my car and started right up no check engine
light no nun. Also i replaced my spark plugs
recently found pil in 3 of 4 spark plug walls. I
cleared out all the oil. Test drove my car and no
oils leaking into the walls. Just need answers.
Should i take my car into a mechanic