My 1.9 JtdM lacked initial urge when pulling away, like a flat spot. I put it down to a tight engine, and did what I do with all brand new turbo diesels - gave it a helping hand with a throttle blip to get going for a good few thousand miles, and gave it absolutely loads of welly, using plenty of revs on a regular basis.
I've always 'run in' modern diesels with a good thrashing, and colleagues with identical cars have often commented on how much smoother and faster mine turned out to be once the miles started to rack on.
Drive around it for a few thousand miles with a throttle blip, use full throttle and lots of revs on a regular basis, and it'll all but disappear by 4,000 miles. Im my opinion!
AROC Cotswold Section Treasurer
2002 156 2.0 Lusso . . .1976 Spider 2000 Veloce . . . 2009 159 JtdM Ti . . . 1985 90 2.5 V6 Gold Cloverleaf