Yes could be sticky timing control solenoid , if its staying open which will advance the cam this would cause rough running on one bank of cylinders like the fault codes were backing up .
With vcds go into solenoid activations ,there will be 4 i think on that engine , listen for a positive click from each sol. ....its not very loud just like a light clicking sound
I had similar on audi TT , in some cases an engine flushing agent and oil change may just un stick the build up in the actuator body.
Forte do a good engine flush , you havent lost anything if it doesnt work ,just gained a cleaner engine , if it doesnt work yes looks like replacement of the solenoid is first port of call .
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