It is stupid easy to check the mounts. Just take a look. Foot on brake, car in drive, hood open. Give it a solid rev with the other foot. Check in drive and check reverse. Have someone else rev while you look. Just be firm on the brakes. You will see the engine pop out if mounts are done.

Could be something else, but this you can check quite easy.

I'm thinking car warms up, shifts are softer, engine manages to fall back against mount. When hard accelerating, engine stays tight.

Also axles could be it.

Do you have any other symptoms? Maybe a jolt forward?

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