Blue smoke

[Flooringit]

Ok so I bought a truck that needed injectors, it smoked a ton but didn't run worth a flip since it needed injectors. So I put in rebuilt beans. This thing runs great. But if I let it sit it will blue smoke if i drive it and stop at a light and wait till green no smoke at all. But like I said ifit sits a bit I get the smoke.
Any ideas? I wondered if the exhaust was so full of fuel from the injectors being hung open that it's still burning residue. I've Only put 250 miles on it sense new injectors. I notices today that it would smoke then go away then come back. I think someone suggested that oil maybe sliping by the turbo seal. Is there a way to check that with out taking it apart? The wheel has no wobble to it. I'm hoping people can tell me somee ways to find out the cause.
Thanks in advance.