As title. Doing 60 on the motorway, tickled the accelerator and engine vibrated.

Smokes quite bad and when I limped home the engine was rocking back and forth.

Seems a bit of oil has spattered out the rocker breather onto the inlet manifold

Any one experienced

dog bone mount failed?

Nope, I replaced that with a superpro one a few months back.

I'm thinking piston/miss fire