Krustyone

My14 calais runs rough especially when cold, took it to the holden dealer who had it for nearly 3 weeks and say they couldn't fault it ,get it home and does it every day.holden say it's a fuel problem but I don't think so . Any ideas

My Calais would not start after being parked for 15mins at shops. When I returned instruments came on radio and bluetooth worked but no ignition. Called roadside assist and they could not find any reason for it not to start. Even hooked up power pack to boost battery. after another 15 mins car just started. Mechanic could not figure out why this happened.
Called Holden Customer Service and asked if the NRMA mechanic had made any reference to the issue, theye informed me that Holden do not receive any feedback on breakdowns but I could request a copy of the NRMA mechanics report. A bit lame considering it would be a usefull tool for them to keep stats on issues in the field. They just told me to take it to a Holden Dealer for them to see what went wrong. Fingers crossed they will.