help! engine stutter :/

[tek9]

Hey guys, i have just replaced the gasket for the turbo return line, oil return line whatever its called as i noticed it was leaking oil, anyways, i have run into another problem, when i get passed 4000 rpms, i notice my engine will stutter, no clue whats causing this, any suggestions?.. im clueless on this one, it did it before i replaced the gasket aswell. maybe my turbo is going out? any help would be appreciated thanks!

 

[brute]

There's been quite a few threads on this lately. Try checking your plugs and wires. Replace if needed.

Hesitation
Hesitation 2

Check spark plugs: Are they NGK BPR6ES's gapped to .028? If not, make them so.
Check spark plug wires: Have you replaced them in the last few hundred thousand miles?
Do a boost leak test.
While the intake pipe is off, check the turbo for shaft play.
Are you using premium gas?

 

[lexx620]

sounds like youre loosing boost