Hi guy trying to figure out why my 2005 Audi a4 1.8t quattro after 2500 rpm starts to bog out and after 4000 rpm it stops I replace my top end I'm my engine cause there was a crack in the valves cylinder #3 and violent was leaking in. Got that fixed but now I think it's my coils again irregular idle in neutral and exhaust manifold turns super red hot within a few minutes. and it struggles to pick up speed. Car has 236997km on it and top end was replaced at 220000km.