So, about a week ago, my car developed a misfire only on boost just after 6k revs, was only in 3rd at that point but now it's in every gear. It's not fuel cut as I have a JAM ecu. It feels exactly like fuel cut, but it's not. I have cleaned the coil/igniter connectors and made sure it has a nice contact with the Bulk head. Tried different leads, cleaned rotor arm & dizzy cap even though they and the leads was new a few months ago. Not tried new plugs get, not done anything with the plugs. What could this be? My cars spec is bellow if needed Speed vision gen2 hybrid ct9 @1.2 bar Jam ecu Magnacore 8.5 leads Side exit exhaust FMIC Iridium plugs heat range 6 *i think* Walbro fuel pump Athena 1.2 metal head gasket Please note it did this even at .8 bar with standard ecu. Going to re-check timing tomorrow and replace the plugs hopefully. Thanks people