I purchased in february a '91 740 turbowagon, 190k, auto trans. This is the first engine-related problem I've had with it. I was driving the car regularly until taking a vacation on 24 July. Between then and my return on 16 August, the car was driven twice for short (<5 mile) distances. I began driving it again upon returning; yesterday (19 Aug) I drove it to a movie theatre and back, after about ten miles on the way back it started turning over strangely and stalled going up a hill. I was able to nurse it home in 1st and 2nd. The car may be due for a tune-up (fuel injectors or filter, maybe?).<p>Now, when the engine is running it is much louder than normal and if I don't give it gas, it stalls. When it's running the engine struggles and shakes much more than normal. I drove it about 200 yards today; the problem is still there, and I'm not sure if running the car is doing engine damage. <p>Given my level of expertise (none), I'll probably wind up taking it to a mechanic. But any advice would be appreciated.