Date registered: Mar 2005
Vehicle: '01-E320 & 02-ST2
Location: John 15:18-19
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I'd say before you do anything else, drive it by an Aamco, they will read codes for free. Write them down and come back here, search them in the stickies or post them.
Plugs are every 30K miles in the M104 and the connectors on the coils are known trouble areas. Again, though, I wouldn't willy-nilly just start swapping parts.
BTW, there is a very inexpensive code reader on Amazon that will do all basic diagnostics (and erase codes, too), it's like $40. If you want more, the Innova's will do real time and data store, but you're up above $150 at that point. If you plan on maintaining your car yourself, a code reader of some kind is indispensable.
Socialism is a philosophy of failure, the creed of ignorance, and the gospel of envy; its inherent virtue is the equal sharing of misery. (Winston Churchill)