I just had an engine swap from my 197k original engine that smoked to an engine with 52k out of a "like new" type place. during the swap also threw on jba long tubes and cajun catless bpipes. I have uprev to tune it, and i did a base tune and it still didn't stop any smoke. Power is there and it definitely runs stronger than my old engine, but the smoke concerns me. It pours out like a smoke machine at idle, when i rev there is a plume of smoke that comes out proportional to how high my rpms go. It calms down some cruising at 55 or 70. It smells like a 4 wheeler exhaust, or like oil is burning. I changed the oil 400 miles after the swap. We found a vacuum leak yesterday on the rear passenger side of the intake manifold, looking at fixing that/seeing whats causing it next. If that doesn't work, what is the next thing to check? Warranty on the engine has about another month left.