My brothers 9c1 stalls intermediatly. Also if he drives the car for a distance long enough to heat up the car after he shuts it down he has to wait for the car to cool down some before it fires up again. Could this be the sign of a bad opti-spark? Also when checking under his hood while the car was running he moved some wires that seemed to come from behind the water pump(Think it was the harness to the optispark) and the car damn near stalled out.