Don't think air is getting into the feul line either as been suffering with this prob for a year now it can go a month without playing up then play up all weekend. Theirs no pattern to when it's going to go?

Hi i have a 95 model disco 2.5. Some times she wont start when u turn the key but just turn over as if theirs no fuel going to it but if u leave it for a min with the ignition off she'll fire straight up. Also she's started cutting out while i'm driving. Has anyone any ideas what it could be...