Starting Problem

[Guest tedboy]

I am having problems starting my 98 GLX. Problem is it will start o/k if it fires up first time (within 5 seconds), but if it fails it will not start at all. It has been to two Ford garages, and has had diagnostics run on it, both garages said diagnostics o/k, but engine still refuses to start. Fault appears to clear after 12 Hrs. when car will start only on first turn again. The present garage has had the car for 5 weeks and has replaced the power hold relay and engine speed relay. They keep phoning me to say they think it’s fixed but want to keep car for another day to test, and then ring to say it will not start. Please can any one help ?..... And yes have thought of setting light to it!