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I just put a snostuf rumble pack and a new track with 168 studs on my 98 zl5 carb and I noticed it delays quite a bit getting off the line, it crawls for about a second until it gets to about 5-7 mph then just takes off. I looked at the plugs and they looked nice except they were completely dry. So the guys I was with think I should go aboutr 2 jet sizes up. But if I can gain some performance by going even richer I would rather do that.