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timing
If the engine was recently assembled and has run since then, it is possible retensioning will be necessary(as the dealer would require a scheduled retensioning after something like 1500 miles) If this is the case my thoughts on the timing belt jumping cogs would be likely. The timing belt light should come on possibly if tension is loose..but it is also easy to incorrectly reassemble the tensioner warning system wiring... You stated that the engine has compression so i am assuming there are no bent valves..
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Heraclitus: 1987 porsche 928S4 5 speed black/black moneypit 
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