Hey all, forgive if in the wrong area. You're literally my last hope, as I'm out of ideas. I'm experiencing massive lean issues when driving. It only occurs when in vacuum-off boost. So, motorway driving, cruising or slight acceleration off-boost. I'm observing this on an AEM UEGO thats definitely okay and reading correctly, it'll creep to 20:1 and start breaking up. It's an intermittent problem, happens consistently at 4K RPM, but intermittent everywhere else. Its a late model 180, non vvt blacktop: Standard Turbo Standard MAF Standard Intake Front Mount Walbro 255 (with relay) EBC normally set to 1 bar (disabled while I'm trying to figure this out) New Plugs Tested Coils New Coolant Temp Sensor Timing at 15 degrees at idle Short term self leaning reset via Nissan Datascan. If anyone can help, I'd massively appreciate it. Maybe even buy you a drink if you're in the midlands It's the J4 type ECU, if that aids troubleshooting. Help me DriftworksForum-enobi, you're my only hope.