Dead Ford Focus 2001 ztec 2.0 !!

Have a 2001 Ford Focus ZX3 2.0 Z-tec has new fuel pump and Advanced auto code reader said needs a new MAF Sensor and IAT Sensor put a new one of these on no difference cleaned IAC valve same problem lack of power and stalls cannot get it to go highway speeds without stumbling and missing, fuel filter was replaced a month before fuel pump now hooked new machine up says misfire #3 cyl. any Ideas would be greatly appreciated .!!!

1) Fuel pressure test
2) Compression check.
3) Check physical timing.
4) Catalytic converter back pressure test.