Green gecko v8 engine mk3 tt help

[Technic tango]

I’m trying to get green gecko‘s v8 engine to run after buying his instructions, but it runs very feebly. It turns over with modified cylinders and sort of starts then slows down repeatedly. If Any knowledgeable people that can assist me would help I would greatly appreciate it.  I do have a hypothesis however. My idea the switch less valve is somehow built wrong somehow because it’s very complex, but I still think it is unlikely because the engine turns over although very slowly

[Jurss]

We won't be able to tell. Try to rebuild it. Start with part You are thinking is wrong.

Try to conctact author on Youtube or other media.

[Mr Jos]

As it starts fast, then slows down, it seems like a pressure issue? What compressor are you using? At how many bar? And can you confirm the pressure remains at this pressure during running? Maybe make a video or something so we can see what happens.