HELP! Car was running mint then turned it off, went back out to it about 30minutes later to go get petrol and it was running like this Really lumpy idle and back firing which seems to be out of the injectors :think Checked timing, thats fine. Changed spark plugs, no change. Took Cam Cover off to make sure everything was fine under there, it was. Don't know why it would start doing this Need the car running for Monday because have to drive over 100miles for a funeral Please help. I will get a Vid up of it tomorrow morning but does anyone know what it could be? Really pissed off it with It's a 51 1.8 zafira auto, engine Z18XE.