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Old 03-16-2012, 10:58 PM   #4
Scooby Guru
Member#: 36033
Join Date: Apr 2003
Chapter/Region: SCIC
Location: Tuning Lab
CEO PhatBottiTuning
2006 STi GTX3582 + Meth


There is no leak that the car can have to make it run rich under vacuum.

Every leak makes the car lean out under vacuum.

If you've never replaced the front 02 sensor then do that. Check your spark plug gaps. The last 4-5 sets of "pre gapped" plugs I've gotten we're all 0.045-0.055 and supposed to be 0.028-0.030
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