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'99 C2: Misfire on cyl 6, plus many other codes

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So, my '99 C2 ended up with a sudden misfire on cyl 6 and super rough idle. Relevant codes are
p0341 (camshaft positioning sensor 1)
p1123 (Oxygen sensing lean cyl 1-3)
p1530 (camshaft adjustment bank 1) variocam failure?
p1340 (timing chain bank 1) out of sync
p0030 (Misfire)
p0306 (Misfire cyl 6)
So, I'm going to work my way from easiest fix to most expensive.... I figure 
1) Replace coilpack cyl 6 - have ordered 2
2) Drop the oil and filter and check for any debris. Time for a change anyway
3) Investigate variocam solenoid bank 1 (inspect/change seal first is cheap & easy, then from there...?)
4) Investigate cam positioning sensor bank 1- is this the hall sensor? Apaprently it's tricky to access, on the left side, front of engine near the firewall?
This is a daily driven Australian model 996.1 c2 tip cab with 258,000km. Already fixed a whole lot of other problems in the last few years.
I can deal with a bad coilpack, variocam seal or solenoid, tensioner actuator, guide pads which is what I'm suspecting given the codes thrown out. I have a feeling it's not an IMS grenade, but if it is, the car will be sold for salvage and the next project starts! 
Any tips would be appreciated. I'm pretty handy with tools, but I don't think I'd tackle getting the engine out.
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