Audi a4 2005 acceleration problem
 

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.