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I just replaced the plugs, and it's still lagging. What's your suggestion?

I have a k&n intake, is the stall tq converter the reason why I can't rev up higher than 1750 rpms and why it bogs trying to launch?

A little background info. I have a 2.4 LE5 cobalt. I supercharged it 5 months ago, and ever since then I've had this lag when I hit the throttle from a dead stop. The car kind of bogs and leans out...