99 ford escort engine problem

riding my ford the oil light went on and the car engine cut off.
I change the oil filter and fill it up with oil. the oil pressure went up but the car is working like is missing one cylinder'
I have change the spark plugs and also had my injectors clean and also I have meassure the cylinder pressure to verify that there are no broken rings or problem with the valves, that was oke.
Went pressing the throttle and getting half way it began to lose like power and also my brakes are very hard.

Any help that can help me out.

Thanks

The hard brake pedal is a sure sign of a vacuum problem. Check all your hoses.

I have check all the hoses all are good I also change the PCV valve.
Is there any more help

Thanks,