could be any thing mate, its just a case of elimination it maybe ignition or fuel related which side you start is down to you, if it pops then cuts out maybe a fuel fault check fuel pump voltage and see if it makes any funny noises like buzzing real loud they should not be overly loud then go on to metering head look in the air chamber under the filter make sure there is no fuel in there if all seems good check spark plugs, leads etc and the heated seat fuse if still no good give us a reply.