Hi all, my MK6 Fiesta is hard to start sometimes, but sometimes it's not.

90% of times when you turn the key you need to add throttle for it to fire up whilst turning over. It will fire up eventually if you don't add throttle but it's easier to just add throttle.

But everyone now and again, it'll start straight back up after with no throttle, just like a normal car.

Also, when it's been running it'll always start straight back up with no throttle.

My only thought is something along the lines of fuel pressure/dirty fuel filter. It must be fuel related if I'm having to add throttle, I'd have thought?

It's getting quite annoying, I was wondering if anybody knew what it could be as there are a few petrol heads on here, thanks