Hi guys. Just driving along and the dreaded "restrictive performance" kicks in with a flickering engine light. Drove home in limp mode, lots of smoke from the exhaust when I had to be stationary at the lights. When I pulled up home I opened the engine bonnet and could hear some form of rattling coming from the engine. Then it just cut out. Starts up again but it's running very lumpy and smokey...

Any ideas what's gone wrong?

Thanks