I see in you're other thread you had an error code 51 recorded in the ECU. Has the wiring or TPS been fixed and has the TPS been properly calibrated afterward? Are there any other codes present?
This isn't a boost leak if it's happening at 1500 RPM. The CT-26 doesn't make pressure anywhere near that early. My suspects would be a faulty AFM, TPS or an ignition issue.
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