my dads 1999 45k mls C240 with 2,6l 112912 engine has recently developed a strange problem. when you hit the accelerator hard the check engine light comes on and the engine loses power like it is not running on all cylinders. this stumbling goes away when we stop and restart the engine(however the check engine light stays on). our indie took it to MB to read codes and and it threw every code from plugs to coils, O2 sensors right side, brakeassistant and so on.....so MB wants to start with coils, but the engine is running fine as long as you don't push gas too hard... what about cat? only cylinders 1 3 5 have problem. anybody out there had a similar problem? where should we start????
cheers,
reinhard

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E 240 2000
E 320 Coupe