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Remove the throttlebody and spray some throttlebody cleaner in it and wipe down with a rag. Watch out for the maf. And the idle air valve can be cleaned the same way but do mark it and make sure it goes back on the same position

I would start with cleaning the throttlebody and idle air valve. And check the throttle cable to see if its not sticking

Can you check the live data with the code reader? Then i would check if you get a rpm reading during cranking

Id start with checking if there are any codes. A 2002 uses odb2 so should be easy to grab the codes with a cheap odb2 reader

I would start by pulling the spark plug wires 1 by 1 to see if its related so a cilinder.

Yep. Ill try to make some pictures of the install instructions tomorrow.

To be fair id just rip it out as its easily bypassed and it wouldnt be the first one to fail.

Do these help?

p0171 is a bad maf 9/10 times. The post cat one will never trigger a p0171 as they are only used for checking if the cat works or not. The coilpack engines use a few different op2 sensors so check the connector if you want to replace them.

I would just grab the premix blue stuff.

Are you using the smaller non nats k11 ecu?

Have you seen this? https://www.micra.org.uk/threads/99-micra-ecu-reprogramming.31599/

Looks good! Although id also replace the rubber brake hose to have it all new and shiny but thats just personal preference.

Yes you can bypass it. Connect the black/white wire to the white/black one. theyre across from eachother

Prolly for the connections to the car like some powers, temp gauge, that kind of stuff

Then you can easily replace the ecu. But you need a non nats cvt ecu. Ideally one that matches the engine (1.0 or 1.3)

Depends if you have nats or not. If you have then you cant just replace the ecu. You might be able to swap the gearbox ecu but it wouldnt be something id suspect to be bad.

I went with a nismo headgasket but id advise the aspect head gasket as they sell one thats 2mm thick. Im using a cga3 bottom end. Not the cg13.

Both ecu's are in the middle of the dash. In front of the shifter