Haha, that was my second comment in several years*. If the vehicle was fine and has just started to play up, it is unlikely to be an ECU/tuning problem - a partially blocked fuel filter may give the symptom of 'leaning out', as may a faulty booster diaphram, or anything else that could introduce air. Other things could be the TPS coming loose and throwing off the ECU, bad senders/sensors, etc. I'd suggest at least going back to the mapping it was using before the problem started, as otherwise you're just complicating things and potentially introducing several other problems. Oh, has anything unusual appeared in the logging?Relayed your message to my dad and he says he remembers you helping him out on the red top years ago lol! Had a go messing around with the map but she just doesn’t seem to want to go! Weirdest bit is that she was running beautifully a week ago and has slowly been degenerating since so we’re beginning to think something detrimental has happened mechanically.