Variocam Issue?

[freserf]

Well ... pulled the car out of the garage for testing. Fired up engine with new air filter, fresh fuel, oil, and spark plugs. The engine codes reappeared. Misfire on bank1 with camshaft position code P0341. I did notice that the engine ran fine until the secondary air blower timed out. If I let the codes set at idle ... which is rough, I could clear them and then slowly raise the RPM's up to about 2600 when I heard the timing chain rattle. Reset the codes and was able to hold the RPM's steady at about 1850 without any misfires.

So, I would like some input on what to try next. Idle at engine full temperature is rough due to the misfire detections ... but at cold startup idle is good until secondary air timeout. Able to hold RPM's up with no misfires.

What do you guys think?