Misfiring in Luton, Beds
 

I'm having problems with my Sumo van. It's misfiring when I get to around 50mph, causing me to slow down until the problem rectifies itself. There is a 'bang' (and flames!) at the exhaust. I suspect it may be the fuel filter but need a garage or mobile mechanic in the area that knows the vehicle to confirm this and repair it. Any suggestions? :confused: