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Bumping this thread since I've been randomly having the same issue in my 1/2010 build X5M. Long story short, I've replaced the PCV lines going from the valves covers to the intake, the turbo inlets with new gaskets, -12 index injectors (a few index -07 had failed and leaked, do I replaced them all) and even after my MorePower.dk tune, I'm still getting it. It sounds like the car is stuttering right nefore it happens, can be modulated via throttle input, but it happens if I stay hard in the throttle. Tuner says he thinks it's a boost leak based on the power band readings from the dyno, I'll be replacing plugs and smoke testing it before my next dyno runs.
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650hp 10 X5///M - Stage 2, Vibrant 1794's , gutted cats, custom intake, AC Forged 22's 325hp 98 BMW 740iL - ///M5 6spd, www.bavengine.com w/ Performance Option, electric fan, CF intake tube w/ heatshield, Mag 14816 w/ notched bumper, Bilstein/H&R Stage II/Powerflex 600+hp 02 Harley F150 - MHP900 Stage 3 engine, KB2.3, 8# lower, 60# inj, Walbro FP's
135hp 01 TL1000R - M4 full exhaust, K&N, Yosh box, -1/+2 gears, 2CT's
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