My engine on the ml320 develop a rough idle again. The mechanic had clean the egr tube about a year ago. I think I located the egr valve on the passenger side of the engine under the big air intake tube. There was a small 2 in C-shape tube which I pulled and cleaned. The engine check light went off and the idle seems ok at this point. I have not seen a picture of the EGR valve and a clogged tube on this web site. Did I do it right?

Thanks,

John