Yeah that makes a bit more sense, was confused when you said you bloked it up.

I dont think it would be the actuator as you've said it would drop then go back again. If the actuator is failing to hold boost it will just drop and stay down not surge like you have described.

im having a kinda of similar problem I changed and gapped my plugs a few months ago when I had a misfiring problem and checked coils which looked fine and not problem since but then I took the car in for new valve springs and a new diff since ive gotten it back as soon as it hits 3000 or so starts sputtering my mechanic mate thinks its the pump because he reckons the coils will generally fail on take off said it seems more like its not getting enough fuel could be a similar problem to yours... im going to get the pump changed this weekend and see if it fixes the problem

Edited 27/03/12 12:39 AM27/03/12 12:39 AM by darkness

I've heard of coils failing as the boost increases and the spark has struggles more under compression. Sounds a bit extreme swapping the pump. Can,t you just get the pressure tested? I made a fuel pump pressure tester which fits under the car where the fuel rail hose clips to the metal fuel line. Most tuners will have one and could test the fuel pressure.

Sounds like a coil issue.

Get your coils checked out and if they need replacing you should see this issue go away.

I have a similar issue used to run 15psi now I get max 13-14 I think the actuator has gone soft!