So the old girl ran great last night but when I jumped in her this morning the idle sounded awful. It almost sounds like a cylinder miss. Under moderate acceleration the engine sounds very rough as well. Its a very blurb-blurb-blurb sound. Its strange though because the problem is slightly intermittent. Between 2400 rpm and 3000 rpm the engine sounds fairly normal again. On top of that there were a few times when the blurbiness vanished for a few moments.

Are there any electrical components I can inspect that might fix this? I should mention that my serpentine belt let out a nasty squeal this afternoon and looks a little worn. Is that related to my issue?

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'90 300SE --- 173k miles --- (Odometer just stopped working!)

'85 Cali 300D --- 193500 miles --- (Second one) Sold Nov '10

'82 300TDT --- 236,xxx miles --- (My first one) Sold July '09