I have a truck with a full tank of gas (12-16 gallons?) that's been sitting for 12 months and I'm about to change the fuel injectors.

The truck can barely make it around the block due to stalling out under load. I've replaced the spark plugs and wires and verified they're all sparking (so ignition coil packs are fine), and I've replaced the fuel filter and determined that the fuel pump is fine. The next thing I want to try is replacing the fuel injectors.

I don't want the old gas to gum them up as soon as I get them in. Should I try to get the gasoline out of the tank before I put in new injectors? And if so, how do I do it and how do I deal with the old gas?

I would have a really hard time storing and getting rid of 16 gallons. I could burn the gas up by letting the truck idle for several hours, but that seems like a horrible thing to do.