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...think its something with fuel. I have a Honda Civic SI [B16A2 Engine]

 
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Caberators suck. I reakon check your fuel pump, or caberator.































Try using a high octane fuel, such as premium petrol helps to make starting a cold engine easier too.

 
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Tune ups go a long way with honda. It is a Si so its fuel injected.















Check the timing and change the plugs.

 
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Well if you think it's something with the fuel, I hope that your putting in premium gas, honda recommends it. Without having any info on parts that you have replaced I would have to say to do a complete tune-up. Spark plugs, wires, distributor cap and rotor. Also like I said before you should be using premium gas, I know people will tell you otherwise but I had a 2000 SI, and the ONE and ONLY time I put in 87 octane my car ran terrible, it's a must for any DOHC Vtec. Good luck!

 
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it might be your fuel pump, intake, or something along those lines