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My N54 did this one time on the highway. Were you able to apply any power after it happened? I was doing about 80, went WOT to get around some yahoo and it shuddered and then wouldn't go over about 60. I pulled over, turned it off, rummaged around in the trunk for the manual to check how dire the engine symbol was and it was fine once I restarted.
I scheduled service and was able to reproduce the effect with WOT again, and it cleared after a minute or so of power off and restarting. It was the HPFP, which was replaced and the next one lasted about 2k miles, but the one after than has been going for about 6k miles so far.
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