Alright. Here's what's up: 88 crx si swapped in b16a obd0 pr3 stock b16a symptoms: after swap, had o2 sensor "b" code, which is either 2&3, or 1&4 cylinders. so, I replaced both sensors...figured it couldn't hurt to just do both. same problem exists now. problem: after car is warm, usually on long deceleration in-gear, cel comes on for o2 b. so, then i figured it could have been wiring from the swap. but now, I have a strange "skipping" sound in my exhuast on cruising, or mostly slight deceleration. it's like it's missing ignition of fuel. so, i talked to my brother, who's going to wyotech, and he talked to someone, and they said it might be a fuel injector. does this sound legit? i mean, it sounds possible to me, but i'm still somewhat a noob at these things. it makes sense because it's only on one cylinder, which would explain why it's always one o2 cel, "b".... is there anything else that could cause my symptoms? ie: cat? stock cat with a custom 2.5" exhaust if that is important. the guy that put the exhaust on said that the cat seemed ok at the time.... could a clogged cat do something like this? or is there anything else? if not, are the fuel injectors serviceable? can i clean them myself? if not serviceable, what should i look for in injectors if i'm looking at going turbo down the line, and maybe some nitrous. i've already bought a aem fuel rail, so i'm fine with buying new injectors if i NEED them. i just need to know what to look for. thanks guys.