I will try and explain the best i can here goes.......If i leave the car for a week or so the starts fine, when i take it out and stop for petrol and turn it off it will start again no problems but if i stop and turn it off and leave it 20 mins or so and come to start it again it will not start, it turns over but will not fire up. I know it could be anything but has anyone had this problem ??

Ive changed plugs, leads, dizzy, rotor arm and the car has a turbo timer on which works fine. Im gonna change the ignition coil next...

Please help me as its driving me mad.............