Best to check if any current DTCs are showing to perhaps get a better understanding of what is going on.
Also may be a plan to carry out your resets.
If you struggle with the above then try disconnecting the battery for half an hour.
Depends on the model of your car.
The DE has 2 cam position sensors, the Rev Up has 4 as does the HR.
Just replace the faulty one with a genuine Nissan part.
An Electromagnetic Induction Heater will make light work of your seized bolts with absolutely no fire risk.
I have used these in the shop for the past 10 years, however, I still have the oxy/accy sitting in the corner.
I am not going to get into your Coilover debate, however adjustable anti roll bars with adjustable drop links are a given.
This will be the main problem relating to the roll that you refer to.
Sway bars before coilovers every time.
I have no experience of the cheap Chinese impeller that you are referring to, however, it will cost more than 500 bucks for an engine rebuild if the impeller disintegrates. Do the maths.
The correct way to fit the timing cover is to leave the dowels in place as they do serve a purpose.
The problem that you are having is that the front cover should be fitted before the mid-sump.
if you fit any other way then you run the risk of oil leaks from the front half moon packing immediately or in the near future.
Sorry, I did not know that you had a JDM car without the Brembos.
These will have to be ordered from Nissan.
Amsterdam is showing stock so 3 days from Nissan UK
I have the shock bolt but not the caliper pins.