03 Toyota Tundra white smoke

crashnsnap

I have a 03 Toyota tundra v8 167k miles. I just replaced the head gaskets and now I'm having issues keeping the truck running. It'll turn over as long as I hold down the gas pedal but then stalls out when its released. A bunch of white smoke is also coming from the tail pipe but smells like gas. Any chance its something besides the gaskets I just fixed? Thanks for the help.
Eric