Gas streaming out of exhaust pipe. Truck felt sluggish and was losing power climbing hills. Let it idle in driveway and noticed liquid coming out of exhaust. Turned out to be gas. Did notice the gas gauge was moving quicker than usual. Then a lot of white smoke. Truck shakes and engine light is now on. What does this mean?

 

White smoke would mean a blown head gasket. You might want to have a shop check for combustion gases in the coolant.

 

I agree with go2fast. White smoke is usually steam from buring coolant due to coolant getting into the combustion chamber usually from a blown head gasket.