acceleration

Hello friends, I commented if you can help me with this that happens to a Daewoo Lanos.
When walking has little strength and when one accelerates in neutral it is very difficult to lift the revolutions, his maintenance of spark plug change and all filters, in addition to a scanner that threw that the valve EGR is defective, this valve was checked and this valve was checked and it was only the wiring of this that was cut. It is repaired but even the problem persists. It has no strength. If someone can help me with this or some idea would be fabulous

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Friend can be many things of the set -up, play in the crankshaft pulley, the obstructed, dirty or bad air flow meter, the hose that goes from the same to the multiple loose or fujas, and the easiest Czech the compect of the vehicle, to the Daewood it happens that they have many problems with the cylinder head, you can also vehicle.

Thanks for the concern to answer my doubts. The truth is that the entire admission system was reviewed yesterday, the admission multiple was taken out and disassembled for revision, it only presented dirt problems, so it was cleaned as new. Then the joint that goes in the escape multiple and this inside the tube was broken down, instead of having the black tube with tizne, it had the white tube just like the water from the teapots inside. The multiple was taken and in each outlet of the cylinders had white. This means that the water of the cooling system is getting into the pistons cameras and with the heat inside the boil system and the white color that is left.
Now the cylinder head will be taken for review and see where the refrigerant is going through.