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I had a lot of issues with misfires a few months after I installed my JB4. It turned out that the bank 1 fuel injectors were leaking. The car would run rough at idle, particularly after a cold start. Check your spark plugs after the car has been sitting overnight and see if there is any gas on them. The injectors are covered under warranty for 7 years/70,000 miles. I was able to get the dealership to change mine out for free with the newest part number (I believe they have been revised twice now because they suck).
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