I have smoke coming out of the tail pipe and my truck is shaking. What is it?

Hello, While that is never a great sign, the color of the smoke will let you know the severity of the issue. White smoke will indicate coolant being burned, most often due to a bad intake or head gasket. Blueish smoke will indicate burning oil, which normally means bad valves or piston rings. Black or dark grey smoke is often a sign of too much fuel in the air/fuel mixture (running rich). You should have a check engine light on, and scanning for codes will indicate a which direction to lean as well. Finally, check the dipstick first. If the oil looks a creamy color, you have coolant in the oil, and the vehicle cannot be driven. This would also indicate a failed head gasket.