Form with Ford Ka, dick in low

Hello, how are you, I have a fault with a Ford Ka, it refined and after that it began to fail in low, when accelerating the engine is heard even but in low bells too much, disconnect the cable of the spark plug 1 or 4 and the engine goes out, and if you disconnect the cable from spark plug 2 or 3 and there is no change in the engine, previously hot it did not fail but now hot but now hot or cold. Question what can be, if any code does not appear in the scanner, and the injectors work well

Hello, it is weird that this happened. I bought a second hand from Madrid at an agency and everything has gone well. What model is your car ???

Did you change the 4 spark plugs? Maybe spark plugs 2 and 3 are short -circuit, or with the minimum spark ...

The cables are bad that the coil is marked with the numbers of the cylinders

I suggest that you change the spark plugs and place the Platinium motorcraft if they are other brand does not work well with this model only with this model