bought this b16 DA and noticed that when I press the gas like normal driving and then let off and hold a steady speed the car seems to pop like something is choking it. Thought it was something with the igniton so I checked my timing. Thats good. Changed out my spark plugs with the iridium densos. Still does it. Then the NGK wires are pretty much new. I also changed out the distributor.

What could it be. the car has intake and some dc headers. stock exhaust. I was thinking that it may be the loading up around the cat. The Da has 243 on her. Then I was thinking it ws the fuel filter but she drives good under full throttle.

what could it be???