I recently acquired an 88 735i that was idling rough by drivable (I even drove it from California to Colorado. This week I tuned it up by basically replacing the spark plugs, rotor and the distributor cap. I did not replace the spark plug leads due to cost and was going to replace them only if the rough idle stayed. The tune up worked great and the car drives smooth. Until this morning.. I drove the car this morning (about 20 minutes) to a coffee shop. After the coffee shop, the car started but as soon as I pressed on the accelerator it hesitated and died. I was able to restart it right away and managed to drive about 60ft to the nearest stop sign. When I tried to accelerate it hesitated and died. I pushed it to the adjacent parking lot and left it there for about 4-hours. When I came back, it started right up, I let it idle for a few minutes, then it died after I pressed the accelerator. I haven't been able to start it since. I would really appreciate if someone can tell me what problem I am dealing with. Thank in advance.