Well my silvia has been running great on the road but have not been driving it at all almost while im sorting some stuff (so its been sitting for a week or so) and I was behind the car when i had someone else driving at and it seemed when the gear was changed that white / very light blue smoke was coming out the tail pipe? i know before i had smoke coming out of the engine because i didn't tighten the bolts on the exhaust manifold but that was fixed. Any other ideas what it might be? the iacv, pcv, air filter, fuel filter, throttle body, all that is either new or been cleaned but its not that. Timing chain was fixed so the car is in time. New oil was also added in.
Or maybe the car needs to be driven on a more daily basis? I also put new fuel in.