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My M103 has had the same exact "chugging" after heat soak, goes away after one or two shifts completely. I've replaced a LOT of things since owning the car and the chugging hasn't changed. My current best guess is fuel injectors leaking a bit of gas after shutoff, causing a semi-flooded/chugging condition on restart.
Performance and gas mileage are above average on my car too, so I'm not too worried about it.
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