Hello everyone I am new to this forum and have within the last year bought a 93 Civic SI with a d16z6. I have been having a couple things that have been kind of weird with this car since I bought it. The first thing is it has always been a little sluggish under 2500 rpm and that is me comparing it to the d15b7 I used to have. It has always smelled like fuel and leaves black soot on my tail pipe. It came with an aftermarket header and the o2 sensor is only reading from one cylinder could that be the issue I can relocate it to where it reads from all 4. its got newer wires and plugs within the past 6 months. Recently I drove it through a huge rainstorm and hit large puddles and during that it was stuttering really bad but the next day was mostly okay, but now it randomly does that under acceleration, which I thought may be cap and rotor got water in it because of where it sits... Any ideas would be greatly appreciated. Thank you.