turbojohn84

hi every1 im new here i hav a mk3 cabby that has an s1 turbo engine in it basically when i bought it it wasn,t sparking so i wired in an xr3 dizzy and now it sparks but when i start it its runs for 3-5 secs and dies yesterday i held the key to keep it running then after a good few attempts it ran itself.i also noticed after it heated up it started to overfuel and i noticed it was overheating so i took the thermostat housing off to find no thermostat,i was told if there is no thermostat the temp sender will not be wrking rite and it'l make it overfuel.i disconnected the cold start valve 2 see if it wud strt without it but it wont fire but when i connect it it does for the 3-5 secs any ideas??maybe faulty cold start valve.im really pickled with the bugger so any replies wud be much appreciated cheers