Timing issue

Mk5 Golf GT Sport TSI 1.4 petrol 140 supercharged and turbo charged. bmy engine code the car is hard to start then when starts engine light stays on, it was flashing before now on permanent also EPC comes on for a minute then goes off.

I have 000833 p0341 camshaft implausible signal intermittent. I have changed camshaft sensor and still the same and getting 5 volts reading from harness plug.

Also, 000771 p0303 misfire cylinder three intermittent. i have swapped coils still cylinder three and changed spark plug and still the same.

Also lambda sensor fault code forget what code but basically no signal/not reading.

And couple others along with super charger clutch something?

When started from cold seems to settle and idle okay, then when warms up a minute it starts erratic idle 5,000-10,000 rpm and has a very slight miss now and then and when driving feels a bit jumpy now.
Odd times else it seems like it as it's speed. Also a bit of white smoke comes from exhaust but not bad.
I have heard these can suffer stretched chains or failed chain tensioner or chain guides but thought with low mileage might be sensor/wires or something? What do you think? Thanks