Whenever I accelerate or slow down the steering pulls to either side, sometimes left, sometimes right. Most of the time I have to have a firm grip on the steering wheel to stop it from pulling either side. The pulling gets more pull when harder acceleration or deacceleration.

I have taken it to a workshop, a wheel & tyre place and a suspension specialist and they all think the car needs a wheel alignment. A full four wheel wheel alignment was done but same results and steering problems still exist.

Still can't figure it out so if anyone know a similar problem, what it is & solution?
Thanks.

l would check all the suspension mountings and engine mounting for wear

I would agree with our SMOD here. I would also check if the wheel alignment was correct when it was last done.