miss fire cylinder 3 & 4

What is your question?

I have a dilemma that I cannot figure out, hope anyone can en-light me. My expedition has 250k miles on it and running very strong. It need some TLC, so I started with the fuel pump replaced with model Delphi (leveling sender was no good), replaced fuel filter model motor-craft, got all fuel injectors tested and refurbished (all tested and pass only 3 were dripping) replace spark plugs and wires by motorcraft and auto-light platinum. Now my engine is running rough. at idle is hardly noticeable but at drive man its stumbling and want to shut off. No check engine light has come on. I tested the fuel pump pressure its at 35psi, when i disconnect the regulator pressure increases to 45psi, so fuel pump & regulator are good. Checked the spark on the wires and is good. pulled out the spark plug and it is wet with fuel. I checked the compression on the piston and its at 140, its good. when in drive, it would give out a rotten egg smell. I even put back the old spark plugs back and still misfire. Has any one seen this issues on these vehicles? my next step is to use the old spark plug wires and move around the injectors. never had a problem before when changing the spark plugs.