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The surging could be due to a boost leak, possibly caused by your slightly crushed and vented 1g BOV sucking in air during idle. Base timing being too advanced can also cause idle surge, along with a list more.
If you just threw the 2g MAS on with no other modifications, it will cause the car to run lean.
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-Matt
Corn burner budget build; safc 16g/14b
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