u/Thamaster11

2015 vw gti usa

I've got a misfire on cylinder 3, only on cold start. It's fine once the engine is warm. I've done the usual coils, plugs, injectors, and carbon cleaning with no improvement. Did a leak down test on cylinder 3 and definitely have some air escaping into the intake manifold. Before I go tearing down this motor to replace valves/rebuild the head, what should I look for? Thanks!