its because the air sensor is not properly seated and there is extra air being sucked in from the sides of where the sensor sits.try to tape the sensor with sum electrical tape where it connects with the pipe. u don't have that problem with the stock intake box because the sensor is seated well on it. also when u disconnect the battery to reset the ecu disconnect the negative and leave it off for at least a minute. i had a generic intake pipe where i couldn't get the sensor properly seated and i had the same problem. after i got another pipe it was fixed.
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