thuk when hard acceleration

[umair]

My caprice ss ls1 gives a thuk noise if I plant my foot hard on the accelerator. It goes thuk then it shoots off and goes forward. If I gently press it it is fine but if I press it hard or sometimes medium it gives a thuk noise. It happens most of the time. Any ideas. Umair

[Cashman_309]

Do you mean a thud? rubber/plastic hitting metal? metal on metal?

Sounds like an engine mount considering its when you floor it.

[MikeCuzzy]

Sounds like a thukking engine mount. Thukking pains in the a***.