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Hey this is my first post so hello. I just bought a 93 Civic Si and have several questions on different things that are interesting on this car and I am trying to work out.
1) The car seems to be really sluggish under 2500 rpm if i give it full throttle I can feel it kind of struggle until that point.
2) The car smells like fuel as I am driving I'm not sure if it has to do with the 4-2-1 header and lack of muffler it stops right in front of the back axle.
3) The speedometer seems to jump around about 5 mph while driving at speeds under 40.
More information about the car it has a D16Z6 and unknown miles.

 
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b18 swap, problem sovled. but it sounds like it could be missing at low rpm, throw on scan tool. could b a cps (crank positioning sensor) possibly cams, try sea foam threw break booster vac line will run like *** till its all out but might help clear up any clogging injectors.