My 89 535i, died on my way to work this morning. I was at a stop light it it just stopped running. No bad idle or shuttering. The weather was very high humidity this morning, with rain on and off. I turned all switches off, then tried to start it again, several times. No luck. Got it pushed into a parking lot, got a ride back home and grabbed my sons volvo. On my way back out of town, I decided to stop and see if she would start, and she fired right up. I decided to just leave it there till I got off. After work I got a tow home, then got it started it right up, drove her around she seemed fine. Where should I start looking, as this is a real pain, when people behind you start honking.