Rough Idle, Smoke, Nailing

[ujourdan]

Car starts immediately after the glow plug light goes off. Purrs like kitten for about 10 to 15 seconds and then starts to cough, rattle, nail and sputter with a lot of smoke. As soon as I drive a short distance the idle is perfect again but nailing persists. Nailing gets less after engine is fully warmed up but is still loud. Car drives like a dream, great acceleration and there is no nailing above 1200 rpm.There is no rough idle when the engine is somewhat warm, even after it was parked for hours. Injector nozzles were replaced and the delivery valve seals have been replaced due to a leak but that did not make any difference. Not sure what to look at next.

.Udo.