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Hello my name is ***** ***** I will assist you. First thing to check is if the spark plugs have been removed, if they were attached correctly. Check this video on how to correctly position the plugs. If they are positioned correctly let me know so that we can diagnose further.
Ok then at this stage i suggest you get the injectors cleaned and the fuel pressure checked. A low fuel pressure will reduce drastically the power of the engine. As for the rpm on neutral it is a safety feature not to damage the engine to not allow it to go above 2000rpm at idle.
Ok then that is a different story as it varies with models. In your problem then i would start with the injectors and fuel pressure as suggested. Also i would check all wiring to the sensors and injectors to make sure you have no corrosion or bad wiring since it is intermittent.