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Jolt sometimes when floored

HDJ

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So I’ve got an sv6 2012 lfx series 2 auto and recently serviced transmission 100km ago. Car so far has done 102864 serviced at 101000. My question is under hard acceleration pedal to the metal sometimes not always I noticed that It jolts twice as it’s accelerating almost as something is holding it back my excuse has been gears are changing however it doesn’t always do it only sometimes like I did tried it 3 times today and flooring was really smooth 6 down to 2 gear where as before 2 days ago idk why it jolted even though it was around the same speed 70-80 when I floored it last time as well.
 

Fu Manchu

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There is a similar thread going to this. A recent suggestion was to check engine and gear box mounts.
 
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