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what RPM are the cams optimized for? I'm assuming that they came with a cam card or some other sheet that says all about them. Chances are that you need to raise your vtec engagement point, because in theory if the engine isn't spinning fast enough to take advantage of the high rpm camshaft lobe, then it could cause it to bog down.
Otherwise it could indeed be a fuel problem. I'm pretty sure you can use the vafc to move the fuel enrichment point, or you can adjust it manually.
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