Just out of interest, what happens if you continue to press the accelerator during the sluggish periods? Contrary to what I posted the other day I am still experiencing symptoms of a very similar nature to what you describe but on the 32v engine.
On occasions of sluggishness I have depressed the accelerator in frustration which results in the CAT warning light illuminating and a huge loss of power twinned with a jarring thud to the transmission. Less than a second later the warning light has disappeared and power delivery is restored albeit in the same sluggish form as moments earlier.
I have noticed at times of poor performance the car seems to change up the gears prematurely (25-30mph on a hill the car will select 4th gear).
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