Skipped timing questions - 2001 986 S 130k

[Jerry1847]

Hi all,

Been struggling with an issue the last few months. The issue seemed to begin with a clogged eBay high flow catalytic converter. I had poor idle one day and gave the car some throttle a few times and part of the molten catalyst was ejected from the exhaust. I removed the cats and have race pipes.

Since then I've had a p0343 code(Porsche code 112), cam position 1 sensor above limit. Also some misfire codes.

I replaced the bank one sensor, replaced all plugs and coils. I also ran a cam deviation test and was slightly out of the "normal" range, but not by much. The biggest issue seems to be at idle, the idle is awful. Limited throttle response, backfires, etc. When the car will rev, it's sounds normal. I drive it around the block a few weeks back (gingerly) and while driving it sounded fine.

Questions:
Is there a way to rule out, or diagnose and true timing issue?
Does anyone know how to test the cam sensor wiring? I see a lot of comments to check that. I did not see any wiring issues with the cam sensor when replacing it.
I'm really trying to diagnose if the clogged cat and related back pressure caused the timing chain to skip.

Thanks!