Quantum 2+2 RS Turbo help

[trackerjack]

Was dead lucky to make it home yesterday as after braking hard my 2+2 CVH turbo was very difficult to start and after a bumping it it managed to run on high revs only, as soon as you lifted off it died.
It will not tick over or run below about 1500 rpm, much as if it had an inlet air leak but I have sealed the servo etc to check.
I suspect the big pink fuel pump relay, any other ideas guys?
When you try to start it it runs a couple of revolutions and stops.
Nice fat healthy spark is there too.