[jcs]

Last year my 87 911 started intermittently stalling/dying while at speed, usually between 2000-3000 RPM while coasting (~50MPH) or decelerating but nowhere near idle engine speed. It doesn't do it very often, and can go hours/days of driving just fine. When it dies, the throttle just cuts out, the battery light comes on and the engine dies. It doesn't misfire or stumble or make any weird noises, the engine just shuts off. The electronics (radio, etc.) seem to continue working fine when this happens.

The other week I drove a half hour, parked, got back hours later and started it up, it was idling for about a minute, and then it died. I tried starting it again and it just cranked and cranked. I gave up, waited a minute or two and then it started up, I drove half a mile and then it died when coming to a stop sign. Then it would just crank again until I waited a minute and it started right up and drove home fine.

A shop looked at it a couple months ago and eventually reproduced it and replaced the DME relay and then couldn't reproduce it again, but they only had it for a day or two after that. It's died a few more times since then.

Any ideas on what to look at next or how to troubleshoot this?