I swapped my 96 Honda Civic a few months ago with a jdm B20b. Car has ran great up until a month ago. It still runs good. But I get horrible gas mileage and it hesitates and wants to fall on its face sort of at low rpms and light throttle under load. I have changed everything to do with fuel and spark. Literally everything other than fuel lines. Changed ecus. It started doing this after I had hooked up a ecu with a baseman with two step for a b20. Only had it plugged it for about 5-10 hit two step a few times yatta yatta yatta. Plugged my stock p75 ecu back in. And ever since then it's Ben doing this. It's mainly when taking off it like stutters and cuts in and it. And since I'm getting horrible gas mileage my assumption is it's running too rich and flooded the motor. It has brand new ngk spark plugs. I've changed them twice now. Changed fuel injectors. Everything. If any of you could help me figure what the issue is that would be greatly appreciated.