coolbloke11

Hello

For some unknown reason my car has started to misfire while driving. It judders and lurches and recently when i have been coming to a standstill at traffic lights or junctions it switchs off. I have replaced the two leads but not the black boxes and when investigating the spark plugs there white which as i understand is a weak fuel mixture. I took the ecu memory fuse out and that seemed to solve the problem for about a week and now it has come back again. My ecu is chipped as well would that have anything to do with it. Getting worried as i have spent alot on the engine as it has had the full works done to it new pistons and valves as well so it can't be any of them breaking can it??? Please help

Oh yea there is a strong smell of fuel and fumes from the exhaust as well. Have had all gaskets on exhaust looked at and there fine