Hi, have a 96 c280. I replaced my MAF. This cleared up the symptoms of rough idle, lag while depressing the accelerator. Now about 3 to 4 months later, the symptoms are back. Along with the codes. Also when unplugging the MAF the symptoms continue. Before replacing my MAF when I unplugged it the symptoms went away, that's one of the reasons why I decided to buy a new one. But this time when I unplug the MAF the symptoms stay the same. Any thoughts on how I should proceed?