Took my intake manifold off, to change my glow plugs and to get my ALDA off. First thing I noticed was the intake valves are coked with about 1/16 to 1/32 of crud, almost all over. Is this normal ? should I try and clean them?, if so how?. I took my Alda off because it had a small leak, it's one of the new style, With it off it would not hold vacuum or pressure unless I pluged the end that attaches to the pump, and when I put it back on it just leaked more then before. I know the leaking part in not good, but where is it suppose to seal? internally or to the pump? The bad news is the MB dealer told me I had to buy the whole pump to get that part now ( he is looking into it for me) anywhere else I can source this part ?

Other than that the car is good, was hoping that adjusting/fixing the ALDA would help with poor performance off the line.