pop pop pop noise on exceleration
 

car made a noise likt a machine gun from right hand side pop pop pop whilst excelerating hard in second
,the boost gauge moved from left to right when it was doing it, boost would not go past 0.7
does the same in 3 4 5 but only makes a pop noise once and hesitation then car runs on up but not past 0.7
could this be down to a dogey actuator.or the code 45 that i cant get rid off,