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So fluttering past 2k rpm, you are fueling it good. Loss of power but no limp or cel. Is the car stock or deleted. If latter who’s tune. Fluttered is quite loud sounds like a turbo. Could be your turbo switchover not opening. Try replicating once you renew your vac lines and converters. For logging I would start with speed, rpm, pedal position, boost requested vs actual vs emp, rail requested vs actual and airmass requested vs actual. Once you narrow it down you can start logging more specific parameters. Use TestO for logging. If you do a lot of parameters donot on short full fuelling runs and not on an extended trip. Too much data.
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