Purchased 3 weeks ago. 3 specific problems. 1 white smoke at start up lots. PVC vaulve has been replaced still smoking. There is a tube that is not connected under the hood. It's directly left to a tube labeled: 90A1C. Has previously been taped but not well. Tried to speed up last week and it felt like the car stalled. It is under warranty but, dealership isn't giving me any answers. I'm gong back tomorrow. Any advice on the tube, smoke and stall? The oil looks clean. Thanks for any help/advise?