You can do that if you think that it is a rich miss, however it might not be fuel related. If the car is not knocking right now you can play with the AFC and see if you can tune the miss out of it. Just keep a mental note of your original settings so that if it is not the problem you can put the AFC back to its original state.
Try to tune it out as if it were a fuel related problem, if thats not it, then repost what it did when you messed with fuel and we can take it from there.
CRAIG
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