What's going on I'm Leo from ct

I just brought a 1999 galant Es and I need ideas and help.
New to this scene And not really sure what I can do to this

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Only thing I did was detailed it sense I brought it
Let me know what you guys think and what I can do to this!

Problems car has and I'm not sure about is I changed the spark plugs now it has a cel light I took it to autozone to run the code and they said the plug wasn't turning on the code scanner