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When it is idling rough is there also a kind of knocking/rattle from under the hood?
It could one of two things then, does it set the code only after it has run for a while and the engine is really warm?
did you change both VCT solenoids?
The only other thing that we have seen cause this code is low engine oil pressure or worn camshaft bearing journals, my advice would be to remove the valve covers and remove one of the caps and inspect it, if there are fairly deep grooves in the cap and worn into the camshaft, then it loses oil pressure and cannot control the cam phasers. The engine oil pressure should also be checked with the engine hot, it needs to be over 25psi to properly activate and control the phasers.
let me know what you find.