dodgy morning starts??

[silverzetec]

Hi All,
have an 09 Fiesta Zetec and has been a great car uptil a few weeks ago. The issue is: when starting the car in the mornings, after about 30 seconds or so the car will miss and shudder. the car then recovers itself and all is well. It doesnt matter if the car is idling in park or has been put into driver or reverse. This only happens on first start in the mornings, and occasionally later in the day if the car has not been driven since the morning.

when i bought the car it had been filled up with ULP. but i have since been using vpower 100ron. could this be the issue? it has been very gradual and appears to be getting worse.

the vehicle has been back to Fords and they have reprogrammed to puter, but issue has remained. They are liasing with a german team to find the issue.

any ideas?