Q: The engine RPMs drop and it stalls

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I have a problem with my polo 9n, 1.2 azq engine, when running at idle if i accelerate suddenly with the pedal on the ground,when the engines deccelerates , the revs drop and the engine shakes ,sometimes it revives ,sometimes stalls.what could be the problem?vcds shows manifold pressure sensor (it's working fine)and idle higher than expected.
My car has a manual transmission.

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