I have a number of unrelated questions about some issues:

1- How do I change the light bulb in the passenger side vent? it is out ....also out is the bulb in the heat adjustment dial of my climate control. how to change that also?

2- While gear in Drive, and standing still at a traffic light, i have a bit of a rumble in the cabin. it seems to be a rhythmic rumbling that repeats every second or so, and then goes away, comes back...etc. it is faint, but to my ears is annoying. if i put it in neutral, it goes away, and everything smothes out....transmission mount? the ocilating nature of it is what worries me....vacuum issue?

3-I don't like the smell of my exhaust when the car first starts. It is not oil or coolant smells (i know those), is it running rich or something?

5-When i first start the car in the morning, idle seems to jump for a second and then goes back down to normal. any ideas what could cause that?

6-What are the common sensors on the 104 engine that affect engine performance the smoothness the most?

thanks in advance

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1993 300E, 2.8 M104 .....