engine starts stuttering at between 4-5000 rpm and new symptom

[sayer88]

Hi everyone I'm having an annoying issue with my 96glanza, if I put my foot flat down soon as revs hit between 4500-5000rpm the car starts stuttering and spluttering but if I put foot down 1/2-3/4 it will rev round to red line no problem at all????? But now every time the engine stutters it doesn't boost and it has now started to force the coolant out of the coolant bottle out of the over flow hole on the cap so much so it's come up and running down the out side of my passenger fender help!!!!! Any help or advise would be great thanks Dan.