well i might be having a similar problem. when under boost the turbo makes a loud whistling sound it has never done that before. its boosting around 8psi. could it be a boost leak or a malfunctioning turbo?
in my engine, the screw is fully closed and it idles a little bit high. a mechanic told me that it should be at least one and a half turns open. is this true?
Check for codes. Sometimes even if the CEL is not on, codes are stored in the ECU. Try checking igniter and resistors too. I had that problem. I only replaced the Coilpack and everything worked fine.
1)Get a Piggyback system. This will help regulate your Fuel/Air ratio. HKS FCON will work fine
2)Have the ECU tuned. when running bigger injectors you always want the ECU to be tuned
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