i have a 1993 mercedes 300E 2.8 i had to change the valve cover gaskit because i was getting oil pooling around the spark plugs i also changed the spark plugs. aftern that my car wouldnt start it turns over fine i replaced the plug wires and the 3 coils and still nothing just turns over i checked the spark and relized im only getting spark from the first coil nothing els is sparking im lost on what to do next. any help would be greatly appreciated