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Originally Posted by Blue
I have just started to notice that occasionally when accelerating through the gears especially 2nd and 3rd I get a flat spot what would be causing this as it happens whether the engine is hot or cold. :chicken: The second problem I had today was when I started the car from cold today quite allot of smoke appeared then cleared from the muffler.
Can anyone help shed any light on this, many thanks 
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I can't be definative, but it sounds similar to what I experienced. Under hard acceleration (where it wasn't "rolled on") I felt a distinct flat spot that wasn't there before. About 1 month later I started noticing hesitation coming off the line along with a few instances of white smoke (not atypical for the Boxster). A few weeks after that the hesitation became flat out jerking.
A trip to the Porsche doctor revealed that I need to replace the MAF. It ran fine for about a week and then started up again. One more trip and they replaced a plug that had fouled too much during the MAF issue. After that - wonderfully smooth acceleration.