Engine will not start unless gas pedel is depressed about 1/4 the way down

What is your question?

Problem started today, I have a 1992 F150 5.0L with EFI with 248,000 miles on it. Engine runs great. Last comlete tune up was 3000 miles ago. This is what happened, When I first tried to start the engine it ran for about 0.5 seconds, I fliped to the rear gas tank and the same thing. Then I tried depressing the gas pedel 1/4 way down and after about 5 sec of cracking the engine started and ran just fine as always. When I got home I tried to start it again and had to do the gas pedel depression again. As this is an EFI engine and I bought it new in 1992 it has alwas started without touching the gas pedel. This issue happens when the truck is both at normal runing temp and when cold.