Scottish Elises

Robin, The car has had an electrical/misfire problem (you've worked out already I'm not technical!!) for next to ever. We replaced every sensor every coil, cable etc etc, then put it on an emerald and told it to ignore the limp home mode. went much better but still struggling at the top end and lap ...

Any advice/experience? Need to change the engine on my 340R after a rolling road blow up