Denis5

hey guys I got a p0171 code on my 96 integra , has a b18b1 in it, the car has a header and a straight exhaust and I’ve had it in there for a couple years and it’s never thrown a code , now all the sudden it has the P0171 code, don’t know where to look and at idle it seems to idle alittle lower than it should, around 700-800 I would say, anybody got some advice on where to look?