Recently my car has started to judder, quite violently and , when stationary and idling. and driving high speed low speed

Took it for diagnostics and it reported its a wiring prob

Replaced the coilpak and plugs egr but it stayed the same and changed.

throttle body and all associated breathers etc, some on said it may b an eath prob i thinging of getting rid coz carnt sort it i need help pls pls also burning pure petrol

Has any one experienced this and got any ideas ?

Thank you in advance,