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I think what you are seeing is similar to what I get in the "Total Misfires" PID with the daskhawk. I see misfires when idling at a stop light, and every once in a while when cruising. However not once has this yielded a CEL or shown up as a trouble code when I check for it.
My understanding is that this is not uncommon for modern cars, particularly those with FI. I brought it up to the dealer several times and they told me not to worry, as have most people I've talked to on the boards.
Apparently the cars run towards the lean side when cruising or idling at a stop in order for better fuel economy, those giving us some misfires. After I tuned my GXP, I actually see less misses due to the richer fuel ratios, so that seems to be true.
So if the car is running good and your not throwing codes, I wouldn't be overly concerned.
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2007 GXP
PCM4Less Tune
Dejon IC Pipes & CAI
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