So I'm new to this forum but I have been reading a lot of things trying to get my car running with no luck. I have a c280 2000 and it starts but only stays on if you pump the gas pedal. First the only codes were p0305 and p0302 changed coil packs plugs and wires the codes are still there. Now two more codes have appeared p0110 and p0456 I think for egr valve. I'm at the end of the road with the car and my next step will probably be to get rid igot but I really don't want to do that! Any help would be much appreciated