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To test the motor mounts and the amount of engine movement pull the emergency brake, lift the hood, start the car and have someone watch the engine while you engage the clutch like you were going to drive. If the engine flops around they need to be replaced.
Regarding the clutch, you said it was a new one. It's very possible that either the flywheel wasn't turned before the new clutch was installed, and or it has since been subjected to high heat - (burnouts?), the flywheel now has burn spots on it and it wants to grab. You will only really see the effects of this in first gear taking off from a stop. Starting in second will mask the issue as you have to rev the engine higher and slip the clutch more.
If that's the problem the only real solution is to pull the flywheel and clutch out, turn the flywheel and replace the disk and probably the pressure plate too.
I hope it's the motor mounts as they are a whole lot easier to change.
Good luck.
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