Code p0171
 

I have a 1998 Acura Tl 2.5, I have been driving this thing a lot I decided to put some fuel injection cleaner in but didn't go and get gas immediately. A day or so later I get the check engine light with the codes P0171. How can I take care of this....I did go fill it up and I figured I would drive for a bit and remove the battery to reset it. But just in case there is something wrong what do i need to do...I know this code says that the car is running to rich. etc....and DIY would would help me a lot.