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I have a 2006 Wrangler SE with a sluggish 4 cylinder. *I've heard of a lot of different things to try, but do any of them actually work?* ANY SUGGESTIONS to get some more POWER OUT OF THAT PUPPY? THANKS!! 8)

I buy and sell about 40 jeep wrangler's a year and I finally bought a 4 cylinder SE model (2006). It's a six speed manual that shifts fine, but I feel like the engine is misfiring. Where would you guys recommend I look first? Spark Plugs? Wiring? Also, any suggestions on getting some more...