Yes, as Dave says test the ALDA to see if it holds pressure by direct connection to the ALDA and then test the lines by connecting to hose that goes to intake manifold. i have one car that loses pressure as fast as I can pump and it surges, the other car (parts car) holds pressure better. I have a bunch of oil in my intake, but no visible oil leaking from the turbo. I've also had a few intermittant plumes of black smoke - 7 in all, 3 with full power, 4 without, not while cruising down the freeway at speed, but rather around town or lightly accelerating on the freeway in traffic. I have not had time for diagnostics yet as I'm rebuilding my suspension.

-brian

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Brian Toscano