Rebuilt SR idling weird, halp

[thisisastickup]

So my buddy just got his SR rebuilt by Touge Factory, and we just dropped it in. He bought a used turbo from a member on here, but I don't think that's the problem.

Details:

-Spark plugs are black
-smoking a bit, but not black/blue smoke, so I don't think it's oil.
-when we put the turbo on the manifold, we got a metal gasket to go from turbo-manifold and didn't use sealer on it, should we do that?
-after the car is turned off, if you listen, there's a hissing noise coming from the turbo side of the motor. Am I right in thinking that this isn't going to be on the exhaust side of the motor? I'm thinking there's a boost leak and that's why the car is running rich, but I don't think that running rich would cause the car to idle like it does.

I'll have a video up as soon as it's done uploading.

[nissan240]

i think the hissing is just the turbo still spooling after the car is shut off. have you taken it for a test drive? if so details of how its running. how is it idling weird? if there's a boost leak you'll know it for sure if you take it for a test drive. maybe you guys forgot to plug in a line somewhere. check all your lines again. also check your tps. and dont forget to check timing!

[mytagsucks]

I was told by touge to let it idle for 20-30 minutes to break it in, then do another oil change before driving so driving it really doesnt seem like an option.

[RD_240]

Hmm..

My buddy had his engine rebuilt by TF as well.. Says it would smoke once in a while and was told by them that its normal.

Did yours smoke?