I have a 85 F150 2 wheel drive truck. I just bought it from my neighbors son and it had been sitting for a few years in their pole barn. I was driving it around one day and after a few miles smoke started coming out the vents. Considering the price paid for it, I kept driving and it went away. Whenever I shift from drive to park and it idles it smokes. Also, when the heater is turned on smoke pours out and even with the window down you get a bad taste in your mouth. I am not a mechanic by any means but this truck is kind of my fix it up project for fun. Any ideas would be helpful