It might sound daft but have you checked the coil pack I had a similar problem coil pack was knackered but also my Ecu was earthing out on the two cylinders inside the box this was on a ms2
I’ve got a set of zx9 bike carbs megajolt Ecu Dan st manifold for a zetec and the aluminium trumpets for the carbs for sale came off my engine when I went turbo £500 ono
any questions drop me a message
location Leicester