My sister has a nice first generation Nissan Micra 4-speed automatic (I think it's the naturally aspirated, non-electronic carburetor version) . However, when starting it from a cold start (not necessarily cold weather, just when it's not used for a couple of hours), it has a problem with keeping the engine running.
It sometimes does not start until you 'pump' the accelerator before ignition. Whether that's necessary or not, it will have a very low RPM after ignition, and will cut out the moment you touch the accelerator, also in neutral. This problem will go away after maybe a minute, after which the car will function as normal, and it's genuinely fun to drive (don't judge...). What could be the cause? Is there an economical fix available for possible causes?
Perhaps related or unrelated: when filling it up, you can only do so very gently, for else it will 'block' just like when the tank would be full - reportedly it's due to a blocked air tube.