So, long story short I had a turbo leak that I got fixed or so I thought but they didn't fit it properly. So anyway, I fixed the leak myself recently and ever since I have had major turbo flutter. I have a forge dump valve, and it had a RED spring in it. I have ordered tuning springs to change it which should be here in the next couple of days, in the meantime I cut the spring slightly to see if it would make any difference, it didn't. My question is, do you think this could be all down to the wrong spring, or another problem, possibly with my dv? Any help appreciated. Thanks 
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