Help Got Problem!
ok, about a year ago i put a jackson racing high flow cat on my 2000 civic si, worked fine for a while then the cel appered, finally fixed it by installing a ziptech o2 simulator and the cel has been off ever since. Just recently i had a skunk manifold and 68 mm skunk tb put on an the car ran fine tonite though the cel came on so i went to autozone and the obd2 scanner said that the #1 cylinder was too lean, also i have a vafc with the correction on -14, what do you think the problem is the o2 sim, afc or something else please help thankyou