Hi guys ain't been on for ages, so me & my lad both have nitro cars I've been doing it for years, he bought a nanda .21 buggy & we broke it in at home on lockdown, so today we took it out to tune it, now this is what is foxing me, hsn is set perfect but the lsn needs to be screwed all the way in & then it's still to rich, will stall if you nail it after 5 secs of idle, ive stripped carb down cant find nothing wrong, all sealed up, surely if it had an air leak I would have to richen it, I've searched on the internet & its happened to 2 other people with same model & sh 21 engine but they couldn't work it out either, might have to try another carb, never had this symptom before on a nitro & I've had my fair share of engines.