sorry been a while as ive been busy with other things (r33 is barely driven)
Changed the spark plugs over the weekend. Didnt look too bad but prob was best to change them. Coil packs are confirmed to be spitfires and are in good visible condition. Did manage to snap a coilpack clip (still clipped in but will get a new coilpack harness to sort that).
Drove the car after - drove ok for 10 mins, then started spluttering and after a while pretty much lost all power. had to fight with it to and after a while able to run around 2000rpm. Took it back home, but when 2 min before i got home, it started driving normally.
Also the day before i changed the spark plugs i tried starting and it struggled first few times but started after a while.
My belief is fuel (though im barely an expert)
Theres fuel in the tank
Fuel filter was changed at last service (around 1500ks ago)
So if it is fuel my guess is the following
Fuel pump?
Fuel lines?
Fuel tank?
Injectors?
Any idea how to check/test them
or any other ideas on whats causing this?