I've just returned from a 2700 mile round trip to Western France during which mine tried to kill me
several times due to a fault almost exactly like #2 described by the OP.
Overtaking when you're sitting on the wrong side is difficult enough without the car throwing its toys out of the pram when you do attempt a manoeuvre, leaving you facing oncoming traffic with what feels like the power output of a moped at your disposal,
. With mine it always occurred when the revs were between 2.5 and 3k, but it didn't happen with any sort of pattern making it impossible to predict. It might do it several times in quick succession then not at all for a few hundred miles then maybe once or twice before another lapse and so on,
. Even winding it up first didn't guarantee success - you could push it all the way to 5.5-6k in one gear, change up and then have it unwilling to pull beyond 3k. The feeling was exactly the same as when you hit the rev-limiter, except at half the revs, and as described above the only 'cure' was to lift off then go back on the throttle, exactly as you have to do if you trigger the rev-limiter. A couple of times when it chucked it, I had the windows open and you could clearly hear a loud but short hiss of escaping air, suggesting the turbo dump valve had blown-off.
Coming up the A1 on Wednesday, around Harrogate, the engine management light came on accompanied by the "Have Engine Checked" message but, bizarrely, for the next 70 miles or so it was running better than it had for weeks - that was right up to the point where it went into 'limp' mode resulting in us completing the final 120 miles home at a maximum of 45mph,
. I stopped several times to try and clear it (battery disconnect, the works) to no avail. Thursday morning, when I first fired it up the check engine message came up for a few seconds then disappeared along with the EML,
. It has not reappeared and the engine seems to be running 100% so I don't know if the dealer will be able to identify anything when it goes in next week.
Thinking back, it had been running a little bit 'off song' for a week or two prior to our departure, with an occasional hesitancy apparent when pulling away from low revs, but not enough to make me take it in for investigation. I knew that it would be due its 42k service upon our return so would have it checked then. Having since gone head to head with a juggernaut on a couple of occasions, boy do I wish now I'd taken it straight to the doctor then.