Hello all, new member here. I am having some problem with a truck I recently bought. Could I get some assistance with this? I will try to keep it brief. Vehicle is a 97 Chevy K1500. Symptom: Thick billowing white smoke from exhaust when I first start it cold after sitting a while. Smoke clears up while driving and does not reappear while stopped and idling (like stopped at a light). If I park for a few minutes then, come back and start it white smoke reappears until i start driving. All was fine till yesterday, started doing it this morning.