Ecu
I would look into the world of EPROM editing, you can get rid of fuel cut through that and tune your car at the same time. I would recommend having hardware that can support what you tell the car to do though, or else KABOOM! Ds-Map is not new but kinda a big deal, look into ithttp://www.ds-map.net/ also tuning is not easy and there are lots of options.
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