St170 cutting out

[Pistonpraat]

My st170 wants to cut out whenever I come slow down to a standstill. The battery light come on first n then sometimes the engine cuts out. Iv changed my spark leads, plugs and O2 sensors....I'm wondering what it could be. If anyone has any suggestions or has come across this problem that can help?

Thanks

[mybrainhurts]

Why did you change that lot...?

[Pistonpraat]

I had to change the O2 sensors coz I cracked them and the sparks n leads I changed because I was told they would be the cheapest options to check first but obviously wasn't any of those. Do u have any suggestions?

[Celt]

On the standard focus if the speed sensor is needing replaced or cleaned it causes this. The car thinks its stopped as the dial reads 0 and cuts out. Happened on my 04 focus was still under warranty but not a massive expense.