Peugeot 406 problem goes out the engine

Hi, I wanted to see if someone can help me I have a automatic peugeot 406 1.8 and when I walk independent the melting speed I accelerate it and lose strength and go out but when I stop I walk and part without problem.
Who knows what problem can you have?
thank you.

That cordurian is medium difficult because there are many factors and little time and failure to check it, what I ago is to put a direct cable from the battery to the coil to skip and discard the sheet, if it stops it I recommend you first change the magnet captor that can fail intermittent, but eye because the ignition module and the coil are also at stake, as it can be the fault of the fuel pump that I do not throw away,