Hi no it's not priming when i turn the ignition on i'll have a look at them tonight cheers. A mate who has owned cossie's think's it could be the map sensor any chance it could be that. Prior to it not running at all every now and then it would play up would only boost to 0.3bar and when you hit 4k it would cough like a miss fire. He think's it was the map sensor giving up. Cheers for your help.