Why does my boost/vac gauge vibrate?

[1fastII]

If my engine is running below 2000 rpm, the boost/vacuum gauge vibrates bad, and vibrates a little above 10 psi of boost. WTF caused this? It didn't do it before, and it only started when my turbo studs were redone along with a new gasket.

[jayG]

Duck, check the vacuum hoses to the guage and from the bcv to the turbo for cracks and tighteness.

[Eyelawdoc]

You might also have a weak intake valve or intake valve spring.

[Pat_in_L.A.]

Time for a compression test. Better yet a leakdown test. The sooner the better. The longer you put it off, the more the repairs will cost.

[1fastII]

Oh noes!

But why would it start doing that after getting the turbo to manifold gasket replaced? It was fine before I did the Bob's header/3" exhaust, and I drove it for about a month before I had this done. I had to keep tightening the bolts up until then.