My 1991 Volvo 960 station wagon's engine has been dying off and on for the last several months. The first several instances occurred while the car was idling at a stop light, and all the warning lights would come on. My friendly neighborhood mechanic said it could be the throttle mechanism which he cleaned, and the problem seemed solved for several days. Now it has been cutting out when I am driving (on two lane roads, usually no more than 40 mph) and seemingly when I am off the gas in a slightly slowing mode. The warning lights do not come on... I quickly shift to neutral, turn off the car, sometimes come to a stop and then turn the key and the engine turns back on. Other times I can turn the engine back on while the car is still rolling. It rained hard yesterday and for the first time the car engine quit four times within three miles, and twice on hard right hand turns, uphill. I have noticed before that the right hand turns seem to have a more than average participation in this event. So far I have been lucky - every time this has happened the car starts again immediately after this failure but obviously this is a potentially dangerous situation.
Needless to say I am taking the car back in tomorrow after having it serviced for this problem today. The spark plugs were replaced today. The engine failed twice on my way home tonight from being serviced.
Anybody have any idea what might be causing this failure?