My BX2360 started shaking and stalling while I was mowing. Replaced the fuel filters. Bled lines per manual instructions - turned key on 30 sec., started it up. Worked for a few minutes but now barely runs, shuddering badly, before conking out. Assuming this is a fuel system issue, what should I do next? Not experienced with cleaning/repairing/replacing injectors or the fuel pump but hoping to give it a go. Can't find good info with pics or videos on this machine. The manual is no help. Advice or tips on where to find good instructions will be MOST appreciated.