Hey guys!

Finally got my SW20 running again.
It's got a lumpy as **** idle, doesn't like revving, and is chucking a code 52, which is knock sensor.
 
I have a few theories, but would like your thoughts before I start tearing into this.

other info to add, It's running super lean (like off the scale of the wideband lean), I just did bearings and it's not been started or driven in 4 months.
 
https://www.youtube.com/watch?v=U6T-RSBe774
 
Cheers in advance,
Joe.

Joe, sounds like your timing is way out. Definitely doesn't sound like it's running on all 4 cylinders.

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Because it wont rev etc its bound to be timing. Probably cam timing off by a tooth.

Whats the most important part of comedy timing?

Sounds to me like it's running on three cylinders as Carmickey also said.  That would explain why your wideband is showing lean and causing knock sensor code.
 
Pull your plugs and see if you have a dead one.  Maybe one has fowled up.

Your is timing is out. Have you had the head off? Are they standard cams or after market? If after market you need to degree your cams with the crank, You only need to one tooth out on your belt to cause problems.

Timing is fine. Thats just the classic sound of a Boxer I4 haha... (running on 3)
 
My bet is a plug has cracked/broken during installation.
 
it happens.

To all those who have said my timing is out, it ran fine the last time I drove it, and I haven't taken anything bar the rocker cover off.
It's running stock timing with stock cams, gears and crank, so i certainly don't need to touch that.
 
For those who say it was running on 3 cylinders, you are correct! It sounds like a boxer engine, doesn't it?
 

 
Surprise!
 
Broken Spark plug

The best clue was when you said   "It's running super lean (like off the scale of the wideband lean)."
All that air from the dead cylinder being pumped into the exhaust gives a extremely lean reading on the wideband sensor.

It's idling and revving nicely now.
Still chucking a warning light, but an ECU reset should fix that.
 
Thanks for the input :)