I rebuilt my engine a year ago. I bored it out and put some weisco pistons and k1 rods, New head gasket, oil pump, bearings, polished crankshaft. While the head was off I also threw on some new valve seals... A month ago it started smoking a little at idle and when I would start moving again I would get a puff of smoke and then no more until I idled again. Thought it was the turbo...replaced with brand new bwk3. That didnt help. Thought it was pcv's, replaced those. That didnt help. Stock ecu boosting to normal 11psi...Intake is clean as a whistle... I am starting to think it is my valve guides (the head has 210,000 miles). I've read every thread I could find which is making me lean towards the guides. Anyone have any other suggestions before I tear my head off?