I been chasing a p0301 in my 03 r53 I swapped around new spark plugs less than 1k miles on them swapped wires new coil pack swapped around injectors with new seals. Still have p0301 ran fine until coming to a stop would be the low idle chugging. Eventually it’s now making what sounds like air coming out exhaust. I’ll be pulling the head tomorrow but just looking for recommendations. Also compression test showed cyl 2 at 125 while 134 were at 150