So i put a b16a2 in my 2000 civic, its been having some stutter/hesitation issues since then, i change out the sparks, wires, distributor and rotor, still having issues. no CEL on, just for the Cat converter being messed up. so it started when just driving cold and was thinking well maybe it like to drive only at norm temp, but now it'll will stutter/hesitate at any given moment, regular driving, hard driving, but mainly in low rpms then it catches on at around 4k then takes off. This is seriously pissing me off cause there are so many reason for misfire, if that's what it is ....so i'll take any advise on this. rpms don't rev high when it happens, more of a bogging down affect like it's not getting any air, i can smell fuel just a little on a few occasions. thanks!