My car has recently started playing up, it starts ok hot or cold, but when its cold and you drive off it starts to lack power as though it was not firing on all four, when you push the throttle down it will eventually sort its self and pick up and run ok, but when its warmed up it does not seem to do it, And it has started using more fuel. also when you hold the throttle down it will kick down but wont rev as high as normal before changing up. Can anyone help me with this?