Help, my 85' f150 5.0 efi runs great when it's cold and warming up. Once engine is warm it will buck and kick and sputter until I let off the gas or hit the gas. At idle the engine speed goes up and down and up and down and if left alone will vary so much the engine will die. Fuel filter...

I am Phil. I own a 1985 ford f150 5.0 efi. I love my truck but occasionally need help with it. I hope I can count on you guys to lead me in the right direction when I get stuck on a problem.