My recently-purchased '87 740 GLE (automatic transmission) with just over
200,000 miles (321,868 km) has an odd and intermittent problem. Under low-speed acceleration, the engine will sometimes begin to stumble, exhibiting fuel-starvation or no-spark symptoms. On one occasion, the engine died completely. When it did so, turning the key would not crank the engine at all (this actually happened on the way home after I bought it). After a few minutes of trying to find the hazard light switch, I turned the key and the engine started just fine. Anyone have ideas as to where I should start? I have a Haynes manual on the way, but I'm pretty familiar with automobiles as it is. I was thinking perhaps main relay or fuel filter/pump. Thanks so much in advance for your help.