Hi, my 2003 c108k has slowly lost power (intermittently) and when I switched off the ignition would not restart (makes all the right noises but will not fire up). I have changed the fuel filter and pressed the valve on the fuel line which squirted out fuel. I have spark. I’m not sure where to go next. Had a service last week and two minor errors showed up, MAF sensor and misfire. Car ran fine for a week afterword. Any help would be appreciated.