i have an 05 silverado with 120000 keeps coming up with missfire cyl 1+6 replaced coils plugs wires did compression check checked valve springs nothing seems to be wrong also moved around injectors still the same cylinders looking for advice

 

Thats funny, last summer i had a chevy firetruck come in with the same codes. i did the same as you until my boss told me to replace the fuel regulator valve. ran like a new motor after that! that valve cures alot of issues. id also check the fuel pump and pressure before you replace the valve, but im confident you might have a regulator going out