The shuddering could be caused by several things. Check the front end parts on the Fiesta to start with. A loose or worn part is the most likely cause of the problem.
Could be many things, but the most common are fouled spark plugs or a bad fuel filter.
mobile phones
check tension on fan belt(s)
The correct answer is : drinking and driving
It is important to know the problematic symptoms of a car part. With a fuel pump, problem signs are trouble with accelerating, shuddering, and lurching while driving.
Drinking while driving
Oil in the distributor.
A lot of possible causes, I recommend a careful investigation.
Some of the main causes of road accidents include over speeding and distractions from texting while driving or doing other things while driving. Unroadworthy vehicles and bad weather are also common causes.
If you lost power while driving it could be the alternator. Its not charging your batter anymore
IF the cam belt had gone while you was driving or started while broken then yes is would
Wrap it in a blanket ? Seriously - if it's 'shuddering' chances are there's an air-lock somewhere in the system. You just have to leave the tap running for a while until the air-lock clears itself.