To remove or not to remove

[doli3415]

That is the question...

MY 1998 Boxster 2.5L manual transmission with 114k, is having a few issues. Out of the blue a couple of weeks ago it started to misfire as soon as I put it into 1st or reverser. Ran the codes came up with 300, 301, 302, 303, and 341. Started researching and of course it could be this and it could be that. Replaced the spark plugs, checked the coils and replaced the fuel and air filters. Started the car,same result, and ran the codes and same ones as above along with 1313,1314,1315, and 1319. still misfire codes with emission relevant codes. Replaced the O2 sensors(all of them) Same result again. More research, could be a camshaft position sensor on bank 1. replaced sensor, No help but it kick off more codes. All of the aforementioned plus 1340, 1397 and 0150.

Now I'm beginning to think is a variocam actuator problem, which for me would mean that I need to pull the engine and replace. So back to my question...TO REMOVE OR NOT TO REMOVE? I'm I being too premature or is this where my problem is headed?

Any advise is welcome.