Colacharlie,
This is going to sound crazy:
With the recent work done on your car (the Variocam work).
Was any of fuel injector wiring disconnected????
If it was go back thru them and make "certain" the right wiring connector is connected to the proper injector.
A Fella here on the forum has been having a very similar problem as you.
Misfires without any codes. Bogging or judder when trying to accelerate.
He had two injectors crossed up.
Let us know what you find.
