Please help with a neon 97 void failure

Good, above all, and thank any collaboration, I have a case with a neon year 97 The good car began to raise the rpm being standing up to 2000rpm the empty system was checked and had no leaks or hoses or covered tuverias, the acceleration body was cleaned, the servo brake was checked without leaks, now the car now presents a more considerable fault. RPM low when it is in motion, it has a failure as if it had a cylinder without working eye, the spark plugs and cables were changed, the brake pedal is put as if they were mechanics vary from their normal to very hard state if someone can help me solve this failure because grateful

I recommend that you do a test with a vacuometness to know what happens exactly.
Greetings

The voids work well. It seems to me that the problem comes rather from electronic sensors, this model brings an electronic vaccination that moves another mechanic called EGR or the gas recirculation valve, this electronic vaccination is handled by the computer if there is a lot of air enters and accelerates when closing less air passes and almost loses the minimum the problem is that I do not have how to try this vaccine the mechanical part. is in the regulation of electronic vaccination

That
you must check the EGR valve that is cleaned and lubricated because sometimes it sticks or stuck and it is occupied with such problems, you can check them with a vacuomether, which are not expensive and you get them in Aut Autoos and bain included in the gasoline manometer
you warn any novelty