Hey folks ... i did a search and been reading posts all arvy. But couldn't find the exact same problem i'm having. Brand new 2.0 engine and gearbox and carbs - done about 2000kms. ... Coming home from mid north coast around kempsey, and the engine starts idling really high. feels like its at 3/4 throttle sitting at lights. Since i was on the hwy back and the engine temp was staying low and in 4th gear it just felt like having cruise control, i nursed her home at 90kms. Fast forward to now, back home and as soon as the engine warms up to running temp (around 60-70 degrees on the oil temp gauge) and she starts idling super high. in general she runs with lower power and pretty rough. I thought it was the accelerator cable but it seems fine, and still if it was, that doesn't explain the high idle as the engine warms up. Local mechanic said brake booster line could be leaking ... is that a chance? I've never heard of brake lines causing the engine to rev high. I would have thought maybe a vacuum line or something. It's hard bcos everything is brand new. Cheers if anyone has any ideas i can try!