hard to start on 1998 GMC 1500 Pickup

98 gmc k1500 5.0L only way to start it is to put accelerator to floor,replaced fuel pump,filter,plugs, wires, rotor, cap,pickup coil,tps sensor,intake air temp sensor,and put new injector assembly in, nothing has made it run or start any better any ideas before i take it to the shop and get raped

Asked by for the 1998 GMC 1500 Pickup
Sounds like he did that... Check plugs for oil fowling. Valve guides leaking can cause this problem?
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need a major tune up.