hi i think you have a vac pipe split mate, causing an air leak.
now under ur intake pipe (forge TIP) the EGR valve sits, there is a vac pipe that goes into that, its very commen for breaking right on the egr valve end.
If its not that it could be the secondary air pump leaking, think they are around £250, but in the
ibiza FAQs section there is abit showing you
how to take that out, so you could try just removing it or putting a resistor in the plugh o think its still there just to try that