ok i had my rs s2 out the other day and was running perfect, i have a in car boost control and i was pissing about and i turned the boost up and put my foot down a very small amount and i heard a big pop and bang, i pulled over and the bottom boost pipe from turbo to bottom of intercooler was off, so i re-attached and checked all other pipes before setting off, obviously turned boost back down aswel, everything seemed ok until i was out of traffic and put foot down again and seems to be either overboosting or underfueling, not sure, i have adjustable actuator arm/rod and have since turned that down and that has made it run a little better but still very weak boost/ no boost when engine hot over 3500 revs and on motorway it struggles at 60mph on slight incline,

i was thinking my actuator is knackered or do i have a serious problem or is it something simple

i have checked pipes, inlet, intercooler, metering unit, and took turbo off and that looks fine with no cracks, checked plugs and 1 & 2 were fine but 3 & 4 were slightly sutted on the rim,

any ideas chears